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The Fermi surface of multidomain GeTe (111) bulk single crystal measured with high-resolution angle-resolved photoemission at BESSY II.
SCIENCE HIGHLIGHT
Future Information Technologies: Germanium telluride's hidden properties at the... Germanium Telluride is an interesting candidate material for spintronic devices. At BESSY II, a Helmholtz-RSF Joint Research Group has revealed how the spin texture switches by ferroelectric polarization within individual nanodomains.
Ultracold atoms in an optical lattice have been considered for quantum simulation.
SCIENCE HIGHLIGHT
Modelling shows which quantum systems are suitable for quantum simulations Theoretical physicists have demonstrated a way to simulate the quantum properties of complex solid state systems.
Intelligent mathematical tools for the simulation of spin systems reduce the computing time required on supercomputers. Some of the fastest supercomputers in the world are currently located at Forschungszentrum Jülich (shown here is JUWELS).
SCIENCE HIGHLIGHT
Mathematical tool helps calculate properties of quantum materials more quickly A joint research group at Freie Universität Berlin and HZB has demonstrated a way to considerably reduce the computing time. This could accelerate the development of materials for energy-efficient IT technologies.
This is how the experiment went: Two laser pulses hit the thin film of iron-platinum nanoparticles at short intervals: The first laser pulse destroys the spin order, while the second laser pulse excites the now unmagnetised sample. An X-ray pulse then determines how the lattice expands or contracts.
SCIENCE HIGHLIGHT
Robust high-performance data storage through magnetic anisotropy An international team led by Prof. Dr. Matias Bargheer has now observed experimentally for the first time how a special spin-lattice interaction in these iron-platinum thin films cancels out the thermal expansion of the crystal lattice.
At quantum physics atoms, molecules or photons are used to store information.
SCIENCE HIGHLIGHT
Benchmarking for quantum technologies Does a device do what it's supposed to? This question is particularly relevant when new types of technologies are developed. A comparative analysis presents the diverse tools with which quantum devices can be certified today.
Two of the four magnetic interactions form a new three-dimensional network of corner-sharing triangles, known as the hyper-hyperkagome lattice, leading to the quantum spin liquid behavior in PbCuTe2O6.
SCIENCE HIGHLIGHT
Future information technologies: 3D Quantum Spin Liquid revealed An international team led by HZB scientists has investigated crystals of PbCuTe2O6 with neutron experiments at ISIS, NIST and ILL. They found spin liquid behaviour in 3D, due to a so called hyper hyperkagome lattice.
A bundled soft X-ray beam with a diameter of less than 50 nanometers writes numerous magnetic vortices, which together form the term "MPI-IS".
SCIENCE HIGHLIGHT
New interaction between light and matter discovered at BESSY II A German-Chinese team from the MPI for Intelligent Systems has discovered a new interaction between light and matter at BESSY II. They succeeded in creating nanometer-fine magnetic vortices, so called skyrmions.
Prof. Dr. Johannes Reuther works at the Freie Universität Berlin and the HZB.
NEWS
Freie Universität Berlin appointed Johannes Reuther as W2 professor On April 6, 2020 Freie Universität Berlin appointed Johannes Reuther to the joint W2 professorship "Theory of Novel Quantum Materials”.
This picture shows an X-ray image of the electron beam in TRIB-mode where two orbits co-exist: the regular orbit and the second one winding around it closing only after three revolutions.
SCIENCE HIGHLIGHT
BESSY II: Ultra-fast switching of helicity of circularly polarized light pulses The ultra-fast change of light helicity is particularly interesting to observe processes in magnetic materials and has long been expected by a large user community.
Felix Büttner has set up a holography chamber at Brookhaven National Laboratory.
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New Helmholtz Young Investigator Group at HZB Topological solitons occur in magnetic quantum materials and can contribute to extremely energy-efficient switching processes. Büttner wants to develop a new imaging technique at BESSY II to study these quasi-particles.
SCIENCE HIGHLIGHT
Topological materials for information technology offer lossless transmission of... New experiments with magnetically doped topological insulators at BESSY II have revealed possible ways of lossless signal transmission that involve a surprising self-organisation phenomenon.
The Russian-German Laboratory operating its own beamline at BESSY II.
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New instrument at BESSY II commences user operation A new instrument became available to the users of BESSY II on Oct. 28, 2019. The new beamline and apparatus for spin- and angular-resolved photoemission in the Russian-German Laboratory at BESSY II have successfully completed their test phase.
The illustration demonstrates skyrmions in one of their Eigen modes (clockwise).
SCIENCE HIGHLIGHT
Dynamic pattern of Skyrmions observed Now a team has succeeded in developing a new technique at the VEKMAG station of BESSY II for precisely measuring these vortices and observing their three different predicted characteristic oscillation modes (Eigen modes).
View into the experimental hall of BESSY II at HZB, Berlin.
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Physicists develop "time machine" for materials research Researchers from Martin Luther University Halle-Wittenberg (MLU), Freie Universität Berlin and Technische Universität München will develop fast electronics for data acquisition at BESSY II. This will enable researchers to evaluate the data more extensively - ...
The new german russian undulator beamline at BESSY II
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German Russian collaboration further strengthened at HZB Cooperation project at BESSY II further expanded: Research on topological insolators is pushed by additional funding from Helmholtz Funding
Experiments at the femtoslicing facility of BESSY II revealed the ultrafast angular momentum flow from Gd and Fe spins to the lattice via orbital moment during demagnetization of GdFe alloy.
SCIENCE HIGHLIGHT
Laser-driven Spin Dynamics in Ferrimagnets: How does the Angular Momentum flow? A team of researchers led by scientists from the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) has now been able to follow the flow of angular momentum during ultrafast optical demagnetization in a ferrimagnetic iron-gadolinium ...
The cones represents the magnetization of the nanoparticles. In the absence of electric field (strain-free state) the size and separation between particles leads to a random orientation of their magnetization, known as superparamagnetism
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Spintronics by “straintronics”: Superferromagnetism with electric-field induced... Spintronics by “straintronics”: Switching on superferromagnetism with electric-field induced strain
The model refers to a cubic crystal structure (pyrochlore lattice). Not only were magnetic interactions between the nearest neighbours included, but also with the next nearest neighbours (see drawing).
SCIENCE HIGHLIGHT
New insights into magnetic quantum effects in solids Using a new computational method, an international collaboration has succeeded for the first time in systematically investigating magnetic quantum effects in the well-known 3D pyrochlore Heisenberg model. The surprising finding: physical quantum phases are ...
Shown are the magnetic fluxlines inside a superconducting sample of lead in two different directions. The scale bar is 5 mm.
SCIENCE HIGHLIGHT
Neutrons scan magnetic fields inside samples With a newly developed neutron tomography technique, an HZB team has been able to map for the first time magnetic field lines inside materials at the BER II research reactor. Tensorial neutron tomography promises new insights into superconductors, battery ...
The laser pulse (red) generates heat in the thin-film system. The physical mechanisms by which the heat is distributed can be analysed by temporally resolved X-ray diffraction experiments.
SCIENCE HIGHLIGHT
Future information technologies: nanoscale heat transport under the microscope A team of researchers from the Helmholtz-Zentrum Berlin (HZB) and the University of Potsdam has investigated heat transport in a model system comprising nanometre-thin metallic and magnetic layers. Similar systems are candidates for future high-efficiency ...
With this experiment, the team could observe how magnetic order is changed by sudden heat.
SCIENCE HIGHLIGHT
Future information technology: Microscopic insight into processes when magnets... Magnetic solids can demagnetize upon heating. Despite decades of research, it has so far been unclear how this process works in detail. Now, for the first time, an international group has observed in a step-by-step manner how sudden heating affects the ...
Fossils like this 250 million year old skull of a lystrosaurus can be examined very carefully by neutron tomography.
SCIENCE HIGHLIGHT
Neutron tomography: Insights into the interior of teeth, root balls, batteries,... A team of researchers at Helmholtz-Zentrum Berlin (HZB) and European Spallation Source (ESS) has now published a comprehensive overview of neutron-based imaging processes in the renowned journal Materials Today (impact factor 21.6). The authors report on the ...
Laser light for writing and erasing information – a strong laser pulse disrupts the arrangement of atoms in an alloy and creates magnetic structures (left). A second, weaker, laser pulse allows the atoms to return to their original lattice sites (right).
SCIENCE HIGHLIGHT
Writing and deleting magnets with lasers Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia in Charlottesville, USA have found a way to write and delete magnets in an alloy using a laser beam ...
The magnetosomes form a chain inside the bacteria's cell shows the electron cryotomography (ECT).
SCIENCE HIGHLIGHT
BESSY II sheds light on how the internal compass is constructed in...
Dr. Nele Thielemann-Kühn was awarded the Innomag Dissertation Award 2018.
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HZB scientist got the dissertation prize at the spring conference of the... Dr. Nele Thielemann-Kühn was awarded the dissertation prize of the magnetism research group at the spring conference of the Deutsche Physikalische Gesellschaft (German physical society/DPG) in Berlin. The prize is awarded for outstanding research in the field ...
Sketch of the stripe order: The charge stripes, which are superconducting, are shown in blue. Reprinted with modifications from Physical Review Letters.
SCIENCE HIGHLIGHT
User research at BER II: New insights into high-temperature superconductors After 30 years of research, there are still many unsolved puzzles about high-temperature superconductors - among them is the magnetic "stripe order” found in some cuprate superconductors. A Danish research team has taken a closer look at these stripes, ...
Professor Catherine Dubourdieu is head of the HZB Institute Functional thin film oxides for energy efficient future IT.
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HZB researcher Catherine Dubourdieu appointed full professor at Freie... Catherine Dubourdieu has become a full professor at the Freie Universität Berlin commencing December 2017. The Freie Universität Berlin is one of eleven German elite universities in the German Universities Excellence Initiative. Her position will be that of ...
A short laser pulse pertubates magnetic order in dysprosium. This happens much faster if the sample had a antiferromagnetic order (left) compared to ferromagnetic order (right).
SCIENCE HIGHLIGHT
Future IT: Antiferromagnetic dysprosium reveals magnetic switching with less... HZB scientists have identified a mechanism with which it may be possible to develop a form of magnetic storage that is faster and more energy-efficient. They compared how different forms of magnetic ordering in the rare-earth metal named dysprosium react to a ...
Additional spots appear on the neutron detector starting at a magnetic field strength of 23 Tesla that reveal the new magnetic order in the crystal.
SCIENCE HIGHLIGHT
High Field Magnet at BER II: Insight into a hidden order A specific uranium compound has puzzled researchers for thirty years. Although the crystal structure is simple, no one understands exactly what is happening once it is cooled below a certain temperature. Apparently, a "hidden order” emerges, whose ...
Schematic of experimental setup for PEEM, the laser optics integrated sample holder and the sample.
SCIENCE HIGHLIGHT
Optical control of magnetic memory – new insights into fundamental mechanisms A research team at Helmholtz-Zentrum Berlin (HZB) has shown for the first time how laser modulation of magnetic properties in materials is influenced by thermal effects and how the process occurs under moderate experimental parameters. At the same time, the ...
Kickoff with a meeting on 19 June 2017: Prof. Borisenko, Dr. Rienks, Prof. Büchner (all IFW), the leader of the Young Investigator Group Dr. Fedorov; Dr. Varykhalov and apl. Prof. Rader (both HZB) (from left to right).
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Kickoff for Joint Lab with IFW Dresden The Leibniz Institute for Solid State and Materials Research Dresden (IFW) and Helmholtz-Zentrum Berlin (HZB) have created a Joint Lab for "functional quantum materials” and under its umbrella a Young Investigator Group.
This optical zone melting furnace is producing large single crystals.
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New at Campus Wannsee: CoreLab Quantum Materials Helmholtz-Zentrum Berlin has expanded its series of CoreLabs for energy materials research. In addition to the five established CoreLabs, it has now set up a CoreLab for Quantum Materials. A research team from the HZB Institute for Quantum Phenomena in New ...
A magnetic field pulse switches the initial vortex state to "onion state” with two walls. In the subsequent magnetic snapshots the domain wall motion is shown. After 58 ns both walls meet and annihilate, thus completing the switching process into the opposite sense of rotation.
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Green IT: New switching process in non-volatile spintronics devices Physicists achieved a robust and reliable magnetization switching process by domain wall displacement without any applied fields. The effect is observed in tiny asymmetric permalloy rings and may pave the way to extremely efficient new memory devices. The ...
Gerrit Günther und Veronka Grzymek help Zhilun Lu with the experiment.
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NEAT starts user operation The newly built time of flight spectrometre NEAT has welcomed its first users: Jie Ma from Shanghai Jiao Tong University and his colleague Zhilun Lu examined magnetic excitations in crystalline samples and enjoyed fast data rate and high flexibility of ...
Diatomic nickel ions (gray) are captured at cryogenic temperatures in an RF ion trap; cold helium gas (blue) serves to dissipate the heat. The magnetic field orients the ions.
SCIENCE HIGHLIGHT
A new record at BESSY II: ten million ions in an ion trap cooled for the first... Magnetic ground states spectroscopically ascertained
The x-ray reflectitivityof the Mo/Si multilayer mirror is changed via a time delayed laserpulse.
SCIENCE HIGHLIGHT
Methods at BESSY II: Versatile cross-correlator for ultrafast X-ray experiments Particularly in the soft X-ray range experimentalists are lacking a broadband method to correlate ultrashort X-ray and laser pulses in space and time. Only recently, a team from Helmholtz-Zentrum Berlin and the University of Potsdam was able to achieve this ...
X-PEEM images show the orientation of magnetic domains in the permalloy film overlaid on the superconducting dot (dashed square) before (left image) and after the write process (right image). In this sample the domains (arrows, right image) are reorientied in a monopole pattern.
SCIENCE HIGHLIGHT
Future Information Technologies: New combinations of materials for producing... An international collaboration at BESSY II has discovered a new method to inscribe exotic magnetic patterns such as magnetic monopoles into thin ferromagnetic films. Such unconventional orientation of magnetic domains might open a new path for the design of ...
More than 100 experts did gather at the international conference "Dynamic Pathways in Multidimensional Landscapes", which was held in September in Berlin.
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VI-Conference "Dynamic Pathways in Multidimensional Landscapes 2016" Near the museum island, in the heart of Berlin, the International Conference "Dynamic Pathways in Multidimensional Landscapes 2016" has taken place last week. More than 100 international experts met at the Magnus-Haus of the German Physical Society from 12 ...
A section from the crystal lattice of Calcium-chromium oxide showing how the spins are subject to conflicting demands. In this ball-and-stick model, the green and red sticks connecting the atoms (grey and black balls) represent ferromagnetic interactions while the blue sticks represent anti-ferromagnetic interactions.
SCIENCE HIGHLIGHT
Novel state of matter: Observation of a quantum spin liquid A novel and rare state of matter known as a quantum spin liquid has been empirically demonstrated in a monocrystal of the compound calcium-chromium oxide by team at HZB. What is remarkable about this discovery is that according to conventional understanding, ...
BFO has a perovskite crystal structure.
SCIENCE HIGHLIGHT
New effect on laser induced switching for higher data densities An international collaboration has now demonstrated a completely new approach to increase data density in storage media. They used ultra-short laser pulses to trigger a phase transition in the ferromagnetic material BaFeO3 (BFO). Experiments at the Femtospex ...
Scanning electron microscopy in combination with EELS electron spectroscopy permits to visualise atomic positions of the individual atoms in the heterostructure: Superconducting regions of YBaCuO are identified by yttrium (blue) and copper (pink), the ferromagnetic layers by manganese (green) and lanthanum (red). Courtesy MPI Stuttgart.
SCIENCE HIGHLIGHT
Coexistence of superconductivity and charge density waves observed
The nanostructured membrane has a honeycomb pattern with nanoholes of 68 nm in diameter. The nanoholes pin down the magnetic domains.
SCIENCE HIGHLIGHT
Spintronics: Resetting the future of Heat Assisted Magnetic Recording A HZB team has examined thin films of Dysprosium-Cobalt sputtered onto a nanostructured membrane at BESSY II. They showed that new patterns of magnetization could be written in a quick and easy manner after warming the sample to only 80 °Celsius, which is a ...
In pure bismuth-selenide (left) no bandgap is found. With the addition of magnetic manganese (4%; 8%), a band gap (dashed line) arises, and electrical conductivity disappears. This effect shows even at room temperature and contrary to expectation, has nothing to do with the magnetism of the manganese, which shows up only below 10 K (minus 263 Celsius).
SCIENCE HIGHLIGHT
Topological insulators: Magnetism is not causing loss of conductivity If topological insulators are doped with impurities that possess magnetic properties, they lose their conductivity. Yet contrary to what has been assumed thus far, it is not the magnetism that leads to this. This has been shown by recent experiments with ...
Sketch of the structure of both metal oxide layers. Interesting new properties can arise at the interface.
SCIENCE HIGHLIGHT
Metal Oxide Sandwiches: New option to manipulate properties of interfaces A Franco-German cooperation has investigated a sandwich system of transition metal oxides at BESSY II. The scientists discovered a new option to control properties of the interface between the two layers, for instance the amount of charge transferred from one ...
The magnetic structure of LiFePO4
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Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4 A team at HZB has recently unraveled intricate details of the magnetic structure and dynamics of the magnetoelectric compound LiFePO4.Such materials currently find use in sensors but there are promising perspectives for magnetoelectrics to be applied in data ...
The hedgehog-configuration of the spins and the Fermi-Level is shown. Illustration Thomas Splettstößer/HZB
SCIENCE HIGHLIGHT
Spins in Graphene with a Hedgehog Texture HZB researchers demonstrate a fundamental property of the electron spin in graphene
Mapping of the captured magnetisation domains (right, red-blue patterns) in a sample 20 nanometres thick that had been wound in two layers into a tube. The tube has a diameter of 5 microns and a height of 50 microns.
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New technique enables magnetic patterns to be mapped in 3D An international collaboration has succeeded in using synchrotron light to detect and record the complex 3D magnetisation in wound magnetic layers. This technique could be important in the development of devices that are highly sensitive to magnetic fields, ...
These samples with precise proportions of nickel and copper were produced via an improved preparation procedure. Photo: M. Tovar/HZB
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Crystal structure and magnetism – new insight into the fundamentals of solid... HZB team decodes relationship between magnetic interactions and the distortions in crystal structure within a geometrically "frustrated” spinel system
Hexagonal single crystal of SrCo6O11, with a sample diameter of approximately 0,2 millimetres.
SCIENCE HIGHLIGHT
Emergence of a “devil’s staircase” in a spin-valve system A Japanese-German team observes at BESSY II how spins form unusual magnetic structures in a complex cobalt oxide single crystal. Such a material offers new perspectives for spintronic applications.
Frostige Wissenschaften: Experimente mit flüssigem Stickstoff
NACHRICHT
Eine lange Nacht geballtes Wissen tanken Führungen an der Neutronenquelle, Experimente zur Energie für Groß und Klein, Licht-Show und vieles mehr
A thin magnetic FeRh film is grown onto a ferroelastic BTO substrate with two different crystal domains a and c. At 0 Volt ferromagnetic domains (red-blue pattern) are observed above BTO a-domains, whereas above c-domains the net magnetization is zero. At 50 Volt all BTO domains are converted into c-domains, which switches off ferromagnetic domains in FeRh.
SCIENCE HIGHLIGHT
New options for spintronic devices: Switching between 1 and 0 with low voltage Scientists from Paris and Helmholtz-Zentrum Berlin have been able to switch ferromagnetic domains on and off with low voltage in a structure made of two different ferroic materials. The switching works slightly above room temperature. Their results, which are ...
Dichromium: both chromium atoms "share" the 12 valence electrons which leads to a multible bond.
SCIENCE HIGHLIGHT
Stretch and relax! – Losing one electron switches magnetism on in dichromium An international team of scientists from Berlin, Freiburg and Fukuoka has provided the first direct experimental insight into the secret quantum life of dichromium. Whereas in its normal state the 12 valence electrons form a strong multiple bond between the ...
The insulating LFO-layer in its normal state is antiferromagnetically ordered (AFM) and has no ferromagnetic domains. Due to the proximity to the ferromagnetic LSMO, ferromagnetic domains develop (white arrows) at the interface, pointing into the opposite direction of the LSMO-layer.
SCIENCE HIGHLIGHT
Insight into inner magnetic layers Measurements at BESSY II have shown how spin filters forming within magnetic sandwiches influence tunnel magnetoresistance – results that can help in designing spintronic components.
180 scientists listened to the lectures. The aim of the dialogue is to identify future scientific fields as well as expectations, needs and requirements for BESSY II.
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BESSY II – From Pico to Femto – time resolved studies at BESSY II 180 scientists attended the workshop on time resolved studies
The local magnetisation is depicted by small arrows; a magnetic vortex is located in the centre. A brief current pulse through this nano-wire deflects the skyrmion out of its rest position; it then moves back to its initial position on a spiral trajectory. This motion can be observed with the help of X-ray holography. The skyrmion and the spiral shape of its trajectory are represented schematically above the structure.
SCIENCE HIGHLIGHT
Spintronics: Dance of the nanovortices The trajectories of small magnetic entities referred to as skyrmions have been captured and recorded with the help of X-ray holography. Researchers gained new insight from the analysis of this motion: these nanoscale vortices possess mass. The discovery is ...
Hard disc from space: the Pallasite meteorite, studied by Harrison, contains information about the early solar system.
SCIENCE HIGHLIGHT
Messages From Space Geologists from the University of Cambridge uncover hidden magnetic messages from the early solar system in meteorites measured at BESSY II. The team of scientists led by Dr. Richard Harrison has captured information stored inside tiny magnetic regions in ...
A general view of the VEKMAG end-station. The vector magnet chamber (grey) is supported by a hexapod frame. Below the magnet one can distinguish the detector chamber (green) and in the forward direction the deposition chamber (dark grey) is displayed. The beam quality is monitored by a diagnostic chamber (yellow) positioned in front of the magnet chamber.
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“VEKMAG” at BESSY II creates 3D magnetic fields in samples Together with HZB, teams from the Universität Regensburg, from the Freie Universität Berlin and from the Ruhr Universität Bochum have jointly set up a unique measurement station at BESSY II: a vector electromagnet consisting of three mutually perpendicular ...
Researchers at PSI spotted a curious black-and-white magnetic substructure on a five-by-five micrometre square – and were reminded of the stylised Batman logo. The black areas reveal where the magnetisation is pointing downwards, i.e. into the picture; the white ones where it is pointing upwards.
SCIENCE HIGHLIGHT
Batman lights the way to compact data storage Researchers at the Paul Scherrer Institute (PSI) have succeeded in switching tiny, magnetic structures using laser light and tracking the change over time. In the process, a nanometre-sized area bizarrely reminiscent of the Batman logo appeared. The research ...
HZB-scientists Karsten Holldack, Alexander Schnegg and Joscha Nehrkorn at the BESSY II Beamline.
SCIENCE HIGHLIGHT
New light shed on electron spin flips Researchers from Berlin Joint EPR Lab at Helmholtz-Zentrum Berlin (HZB) and University of Washington (UW) derived a new set of equations that allows for calculating electron paramagnetic resonance (EPR) transition probabilities with arbitrary alignment and ...
Aus dem Technikum
NACHRICHT
Hochfeldmagnet sucht Neutronenleiter Am Freitag, den 12. Dezember 2014 fand der Umzug des Hochfeldmagneten an seinen endgültigen Aufstellungsort in der Neutronenleiterhalle statt. Eine Spezialfirma für Maschinentransporte bugsierte den über 25 Tonnen schweren Stahlkoloss aus dem HFM-Technikum ...
In january 2014, the HFM was just delivered to HZB.
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26 tesla! High field magnet exceeds everyone’s expectations It’s done! The high field magnet is consistently producing magnetic fields of approx. 26 tesla and staying at this value over extended periods of time. And all this in spite of the fact that 26 tesla exceeds the original 25-tesla goal; in other words, ...
Im ehemaligen Plenarsaal der Bundesregierung in Bonn finden die Vortäge statt.
NACHRICHT
Deutsche Tagung für Forschung mit Synchrotronstrahlung, Neutronen und... Das HZB ist mit eigenem Stand, Vortrag und Postern präsent auf der Deutschen Tagung für Forschung mit Synchrotronstrahlung, Neutronen und Ionenstrahlen an Großgeräten (SNI). Die dreitägige Veranstaltung findet vom 21. bis 23.09. im ehemaligen Plenarsaal der ...
Outstanding researchers took part in the "New Trends in Topological Insulators 2014” - workshop.
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Leading scientists on topological insulators met in Berlin From July 7-10, 150 researchers met in Berlin to discuss recent findings in the field of topological insulators.
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Invitation: Reception Final Assembly of HFM Six years full of hard work with planning and constructing the High-Field Magnet for Helmholtz-Zentrum Berlin we are proud to inform you that the final assembly is now complete.
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Magnetic switch gets closer to application Scientists from Paris, Newcastle and Helmholtz-Zentrum Berlin have been able to switch on and off robust ferromagnetism close to room temperature by using low electric fields. Their results are inspiring for future applications in low-power spintronics, for ...
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High field magnet for neutron scattering has made its way to Italy After five years of manufacture, the superconducting spool for the new high field magnet for neutron scattering finally took off from Atlanta, USA, inside the belly of an MD-11F Lufthansa cargo plane on October 9, 2013, at 3:00 am EST. The plane landed in the ...
A scanning electron micrograph of a w=500 nm wide and 30 nm thick permalloy ring with radius r=2 μm overlayed with a scanning transmission X-ray microscopy (STXM) image showing the in-plane magnetic contrast.
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Domain walls as new information storage Domain wall motion imaging: at high speeds, material defects no longer play a role
Prof. Dr. Alan Tennant.
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Prof. Dr. Alan Tennant has accepted a new position Prof. Dr. Alan Tennant has been selected as the new Chief Scientist for the Neutron Sciences Directorate, at Oak Ridge National Laboratory. He will start in his new capacity there in November 2013. "We are proud to have had Alan Tennant working with us for ...
Dr. Anup Kumar Bera from the department of Quantum Phenomena in Novel Materials convinced the committee with his poster about ‘Haldane chains’.
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International Conference in Neutron Scattering: HZB-contributions awarded More than 800 participants had gathered for the International Conference in Neutron Scattering, held during 8-12 July 2013 in Edinburgh, to discuss advances in neutron research and the advancement of the neutron scattering instruments and techniques. A ...
Scanning electron microscopy image of the sample corresponding to a top view on the nanopillar structure.
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Shedding light on magnetoelectric coupling Effect opens up new possibilities for digital data storage
Magnet islands: Scanning electron micrograph from a regularly arranged square lattice of magnetic islands. The researchers created the islands using electron beam lithography © modifiziert nach / modified from Physical Review Letters
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RUB physicists let magnetic dipoles interact on the nanoscale for the first time "Of great technical interest for future hard disk drives” Physicists at the Ruhr-Universität Bochum (RUB) have found out how tiny islands of magnetic material align themselves when sorted on a regular lattice - by measurements at BESSY II. Contrary to ...
An ultrafast spin current triggers the emission of Terahertz-Radiation.
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Ultrafast Spin Manipulation at THz frequencies The demands for ever increasing speed of information storage and data processing have triggered an intense search for finding the ultimately fast ways to manipulate spins in a magnetic medium. In this context, the use of femtosecond light pulses – the ...
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Demagnetization by rapid spin transport The fact that an ultrashort laser pulse is capable of demagnetizing a ferromagnetic layer in a jiffy has been well-known since approximately 1996. What we don't yet understand, however, is how exactly this demagnetization works. Now, physicist Dr. Andrea ...
NACHRICHT
Neue deutsch-russische Forschungsgruppe zu Topologischen Isolatoren Der HZB-Physiker Dr. Andrei Varykhalov war mit seinem Antrag auf Förderung einer "Helmholtz-Russia Joint Research Group" erfolgreich. Mit diesem Programm fördert die Helmholtz-Gemeinschaft seit 2006 zusammen mit der "Russian Foundation for Basic Research" ...
Magnetic force microscope image of a 10 by 10 micron sampleshowing the magnetic domains' labyrinthine structure.
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X-ray laser FLASH uncovers fast demagnetization process With the help of free-electron laser FLASH at the Helmholtz Research Centre DESY, an international team of researchers has recently described a most surprising effect that can result in faster demagnetization in ferromagnetic materials. This effect could be ...
▶ Video-Interview with Alan Tennant (6 min, MP4, 122.6 MB) ▶ Video-Interview with Alan Tennant (11 min, MP4, 206.9 MB)
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Prof. Alan Tennant has won the Europhysics Prize, Europe’s foremost prize for... Tennant was honored for the experimental observation of magnetic monopoles using neutron scattering at the Berlin research reactor BER II. He shares the 2012 prize with 5 other scientists "for the prediction and experimental observation of magnetic monopoles ...
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Researchers find spins acting like real bar magnets in a new material An international team of researchers from Switzerland, Great Britain and Germany has discovered an excellent new material for studying the behaviour of spins. The researchers have shown that the spins in the colourless salt of chemical formula LiErF4 behave ...
Fig.: Spectra of one-third atomic layer iron on bismuth selenide.Bisecting lines indicate the material's surface state. The figure's topand bottom portions are symmetric to each other due to time reversalsymmetry, >which also protects the point of intersection.
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In topological insulator debate, scientists document mate-rials' high-level... Following scientists' announcement, new class of materials stakes its claim to holding the key to computer technology's future.
A pictorial view of the coupling mechanism between hard andsoft ferrimagnetic alloys with perpendicular magnetization.
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Resetting the future of MRAM Helmholtz-Zentrum Berlin developed a magnetic valve that novel electronic devices can be realistic
The topping-out ceremony and relaying of the foundationstone for the NEAT building were celebrated at the beginningof December
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Important Milestones Celebrated for the Neutron Instrument NEAT II Around 100 guests attended the NEAT building’s topping-out ceremony / The experimental capabilities at NEAT II were discussed among other topics at the Workshop on Neutron Spectroscopy in the Terahertz Range
Synchrotron Radiation Source BESSY II
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Tiny, Tailored Magnets - CeNIDE Researchers Publish in “Nature Communications” Nanomagnets are used in many places nowadays, from medicine to data storage. Sometimes they have to be strong and and sometimes they have to be weak. Researchers from the Center for Nanointegration (CeNIDE) at University of Duisburg-Essen (UDE) have found out ...
HZB staff scientist Florin Radu checks the BaTiO3 samplealignment in the ALICE diffractometer.
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Locating the Elusive HZB scientists observe how a material at room temperature exhibits a unique property – a "multiferroic" material with potential uses for cheap and quick data storage.
Ein Datenpunkt ändert die Polarisierung: Der Probenausschnitt zeigt die Magnetisierung, während sie sich von oben nach unten umkehrt.
NACHRICHT
Nutzerexperiment bei BESSY-II: Ein schneller Schalter für Magnetnadeln Wissenschaftler aus aller Welt kommen ans HZB, um die beiden Großgeräte – die Synchrotronstrahlungsquelle in Adlershof und den Forschungsreaktor in Wannsee – für ihre Untersuchungen zu nutzen. Doch bevor es mit den Messungen losgehen kann, müssen ...
Top, centre: While the magnetization of gadolinium (red arrow)has not yet changed, the magnetization of iron (blue arrow)has already reversed.Large reversal, while the X-ray pulse (blue) measures it.
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Ultra-Fast Magnetic Reversal Observed A newly discovered magnetic phenomenon could accelerate data storage by several orders of magnitude.
Boundaries of magnetic domains can be computer imagedin three dimensions.
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Imaging with neutrons: Magnetic domains shown for the first time in 3D So far, it has only been possible to image magnetic domains in two dimensions. Now, for the first time, Scientists at Helmholtz-Zentrum Berlin (HZB) have managed to create three-dimensional images of these domains deep within magnetic materials.
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Many Roads lead to Superconductivity HZB-Scientists discovered a unique feature of Superconductivity
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Ein schneller Blick auf komplexe Ordnung Grundlagenforschung zu magnetischen Ordnungsphänomenen in Festkörpern ist eine der Hauptforschungsrichtungen am HZB, bei denen die Kombination von Neutronen- und Röntgenstreuung eine herausragende Rolle spielt. Materialien mit komplexen magnetischen ...
Christian Stamm at BESSY II-beamline for femtoslicing
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First the orbit, then the spin Novel storage materials of the future will be made out of magnetic films. Researchers at HZB are the first to find out just how fast magnetic particles can be controlled.
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X-rays shed light on magnets A new test method developed in Berlin could soon find its way into textbooks. It makes thick, compact magnetic materials accessible, as well as materials used in spintronics and semiconductor technology.
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Data at the end of the Tunnel Electric control of aligned Spins improves Computer Memory
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Golden ratio discovered in a quantum world Researchers from the Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), in cooperation with colleagues from Oxford and Bristol Universities, as well as the Rutherford Appleton Laboratory, UK, have for the first time observed a nanoscale symmetry ...
Prof. A. Föhlisch und Dr. E. Suljoti bei der Arbeit an derUndulatorbeamline UE52-PGM bei BESSY II.
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Wie Kreisel auf atomarer Ebene miteinander wechselwirken Die Wechselwirkungen zwischen Elektronen und dem Atomgerüst in einem Festkörper sind die Grundlage von Materialeigenschaften, die eine zunehmend wichtige technologische Rolle spielen. Dazu gehört zum Beispiel das schnelle Schalten magnetischer Medien, wie es ...
NACHRICHT
MAXYMUS - Neue Einsichten mit Röntgenblitzen Das derzeit modernste Rasterröntgenmikroskop wird vom Stuttgarter Max-Planck-Institut für Metallforschung am Helmholtz-Zentrum Berlin eingeweiht; Experten treffen sich zum Workshop über Röntgenmikroskopie Stuttgart/Berlin: Am 10. und 11. November weiht das ...
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Orbital 2009 - internationaler Workshop am HZB Am 7. und 8. Oktober 2009 findet am Helmholtz-Zentrum Berlin am Standort Adlershof der Workshop "Orbital 2009" mit 95 Teilnehmern aus aller Welt statt.
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Magnetic monopoles detected in a real magnet Researchers from the Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) have, in cooperation with colleagues from Dresden (Germany), St. An-drews (UK), La Plata (Argentina) and Oxford (UK), for the first time observed magnetic monopoles and how they ...
NACHRICHT
Forscher sehen Molekulare Magneten in neuem Licht Erkenntnisse über Molekulare Magnete könnten künftig völlig neue Horizonte für eine neue Form der Datenspeicherung sowie der Spintronik (Elektronik mit Spins) auf der Basis einzelner Moleküle eröffnen. Eine Voraussetzung für die Verwirklichung solcher ...
Auf dem Bild schwebt der Dipolmagnet über einem gekühlten Supraleiter, ein aus Yttrium- Barium-Kupferoxid (YBCO) bestehender keramischer Stoff.
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Dreidimensionale Bildgebung- erstmalige Einblicke in Magnetfelder 3D-Bilder werden nicht nur in der Medizin erzeugt, etwa mithilfe der Röntgen- oder Kernspinresonanztomographie. Auch Materialwissenschaftler blicken gern ins Innere eines Körpers. Forschern des Berliner Hahn-Meitner-Instituts (HMI) ist es nun in Kooperation ...
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Magnetische Fingerabdrücke im Fotostrom Wissenschaftlern des Hahn-Meitner-Instituts Berlin (HMI) sowie der Freien Universität (FU) Berlin ist ein außergewöhnlicher Einblick ins Innere von organischen Materialien gelungen. Die Physiker konnten im Fotostrom erstmals eine Quantensignatur magnetisch ...
Modell des Hochfeldmagneten im Maßstab 1:5
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Der weltweit stärkste Magnet für Neutronenexperimente wird in Berlin errichtet Der Kooperationsvertrag zwischen dem Hahn-Meitner-Institut Berlin (HMI) und dem National High Magnetic Field Laboratory (NHMFL) Tallahassee (Florida State University) zum Bau eines neuen Hochfeldmagneten ist unterzeichnet worden. Er wird der weltweit stärkste ...
Anordnung der Natriumatome im Natriumkobaltoxid, wenn 80% der verfügbaren Natriumplätze besetzt sind. Die Farben Rot und Blau entsprechen den zwei möglichen Positionen der Natriumatome.
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Nanomuster bringen Strom unter Kontrolle: Natriumkobaltoxid als perfektes... Regelmäßige Muster aus Natriumatomen mit Strukturen im Nanometerbereich machen Natriumkobaltoxid zu einem perfekten Material für Laptop-Batterien, effiziente Kühlmittel oder Supraleiter – das berichten Wissenschaftler des Berliner ...
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Stromsignal hinterlässt in Manganitkristall magnetische Spur Optische und kristallographische Experimente belegen erstmals, dass man magnetische Signale durch elektrische Felder erzeugen kann. Für die jetzt veröffentlichten Experimente ("Magnetic phase control by an electric field", Nature, 29. 7. 2004, 430 / 541-544) ...
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Bose-Einstein-Kondensat: Magnetfelder erzeugen ungewöhnlichen Materiezustand In einem Experiment am Hahn-Meitner-Institut in Berlin wurden zum ersten Mal die magnetischen Eigenschaften eines Kristalls für die Erzeugung eines Bose-Einstein-Kondensats genutzt. Dieser ungewöhnliche Materiezustand entstand, als der Kristall in ein starkes ...
NACHRICHT
EU-Projekt zu exotischen Eigenschaften von Helium-3-Atomen Mit einer Förderung von rund einer Million Euro, verteilt über drei Jahre, startet am Hahn-Meitner-Institut ein internationales Grundlagenprojekt, das der weiteren Erforschung der faszinierenden exotischen Eigenschaften des Helium-3 Atoms gilt. Bei den ...