Green information technologies: Superconductivity meets Spintronics
Device where the long range Josephson coupling has been demonstrated. Superconducting YBa2Cu3O7 regions (yellow) are separated by a half-metal La2/3Sr1/3MnO3 ferromagnet (green). © Nature Materials 2021: 10.1038/s41563-021-01162-5
Superconducting coupling between two regions separated by a one micron wide ferromagnetic compound has been proved by an international team. This macroscopic quantum effect, known as Josephson effect, generates an electrical current within the ferromagnetic compound made of superconducting Cooper-pairs. Magnetic imaging of the ferromagnetic region at BESSY II has contributed to demonstrate that the spin of the electrons forming the Cooper pairs are equal. These results pave the way for low-power consumption superconducting spintronic-applications where spin-polarized currents can be protected by quantum coherence.
When two superconducting regions are separated by a strip of non-superconducting material, a special quantum effect can occur, coupling both regions: The Josephson effect. If the spacer material is a half-metal ferromagnet novel implications for spintronic applications arise. An international team has now for the first time designed a material system that exhibits an unusually long-range Josephson effect: Here, regions of superconducting YBa2Cu3O7 are separated by a region of half-metallic, ferromagnetic manganite (La2/3Sr1/3MnO3) one micron wide.
With the help of magneto-transport measurements, the researchers were able to demonstrate the presence of a supercurrent circulating through the manganite – this supercurrent is arising from the superconducting coupling between both superconducting regions, and thus a manifestation of a Josephson effect with a macroscopic long range.
Extremely rare: Triplett superconductivity
In addition, the scientists explored another interesting property with profound consequences for spintronic applications. In superconductors electrons pair together in so-called Cooper pairs. In the vast majority of superconducting materials these pairs are composed by electrons with opposite spin in order to minimise the magnetic exchange field which is detrimental for the stabilisation of superconductivity. The ferromagnet used by the international team has been a half-ferromagnet for which only one spin type electron is allowed to circulate. The fact that a supercurrent has been detected within this material, implies that the Cooper pairs of this supercurrent must be composed by electrons having the same spin. This so-called “triplet” superconductivity is extremely rare.
Mapping magnetic domains at BESSY II
"At the XMCD-PEEM station at BESSY II, we mapped and measured the magnetic domains within the manganite spacer. We observed wide regions homogeneously magnetised and connecting the superconducting regions. Triplet spin pairs can propagate freely in these,” explains Dr. Sergio Valencia Molina, HZB physicist, who supervised the measurements at BESSY II.
Superconducting currents flow without resistance which make them very appealing for low-power consumption applications. In the present case this current is made of electrons with equal spins. Such spin polarised currents could be used in novel superconducting spintronic applications for the transport (over long distances) and reading/writing of information while profiting from the stability imposed by the macroscopic quantum coherence of the Josephson effect.
The new device made of the superconducting and ferromagnetic components therefore opens up opportunities for superconducting spintronics and new perspectives for quantum computing.
Cooperations:
The department of Spin and Topology in Quantum Materials at HZB has participated in this international collaboration (Spain, France, USA, Russia and Germany) led by Prof. Jacobo Santamaria from the Complutense University of Madrid (Spain) and Javier Villegas from the 2Unité Mixte de Physique CNRS/THALES (France).
Funding: To2Dox, ERA-NET, EU Horizon 2020
- Catalysis research at HZB gets new facilityAs part of the CatLab project, HZB has acquired a unique facility for measuring the catalytic performance of thin-film catalysts. Built by ILS in Adlershof, it has now been delivered. The facility consists of a total of eight chemical reactors in which catalytic systems can be tested. At over €2.5 million, this is the largest single investment in the CatLab project.
- Protein crystallography at BESSY II: faster, better and more and more automaticMany diseases are linked to malfunctions of proteins in the organism. The three-dimensional architecture of these molecules is often highly complex, but it can provide valuable insights into biological processes and the development of drugs. X-ray diffraction at the MX beamlines of BESSY II can be used to decipher the 3D structure of proteins. To date, more than 5000 structures have been solved at the three MX beamlines. Here, we present a review and an outlook with Manfred Weiss, head of the research group for macromolecular crystallography.
- Humboldt-Fellow at HZB-Institute for Solar Fuels: Alexander R. UhlAlexander R. Uhl, UBC Okanagan School of Engineering in Kelowna, Canada, aims to develop with Roel van de Krol from the HZB Institute for Solar Fuels an efficient and inexpensive photoelectrolyser for producing hydrogen using sunlight. His stay is being funded by the Alexander von Humboldt Foundation.