Magnetic nanomaterials

In the field of magnetic nanomaterials our research activities focus on systems related to potential applications in spintronics and magnetoelectrics. Simultaneously, we work on the development and fundamental aspects of the methods and the instrumentation which we use in the soft x-ray range. These activities mainly involve experiments at beamline UE46-PGM1 at BESSY II.

In the following we present a few examples of research carried out within the last few years.

For a full list of publications of our institute klick here.

Highlight 2015

EELS maps from an area of the LNO/GTO/LAO heterostructure. © 2016 Macmillan Publishers Limited.

For magnetite nanoparticles with average diameters of 6 nm (a) and for a 200 nm thick magnetite film on MgO (b), a change of the intra-atomic magnetic dipole moment is observable with X-Ray Magnetic Circular Dichroism (blue circles) but not with Vibrating Sample Magnetometry (gray lines). As verified with density functional theory, it is due to a local change in the electronic structure in the vicinity of the Verwey transition where the crystal structure changes from monoclinic to cubic with increasing temperature. © 2014 Macmillan Publishers Limited.

Schematic diagram of the magnetic structure of a N = 2 LNO-RXO superlattice grown on tensile
strain. The Ni moments are illustrated by arrows. Also shown are the electron density distributions in the Ni dx2-y2 (opaque) and d3z2-r2 (semitransparent) orbitals. © 2013 APS

Scanning electron microscopy image of the sample corresponding to a top view on the nanopillar structure. Credit: Uni Duisburg