Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Magnetic Coupling Phenomena

MA 41.7: Vortrag

Donnerstag, 10. März 2016, 11:15–11:30, H33

New insides in Co/FeMn exchange Bias system with detailed XMCD — •Patrick Audehm, Mathias Schmidt, Gisela Schütz, and Eberhard Goering — Max-Planck-Institute for Intelligent Systems

The Co/FeMn exchange Bias system is a wildly studied bilayer system. For the better understanding of the magnetic behavior of the magnetic moments, both spin and orbital character, at the interface, we used XAS (x-ray absorption spectra) and XMCD (x-ray magnetic circular dichroism). One advantage of these measurement techniques is the separation of element specific magnetic moments in spin and orbital contributions at the interface of a bilayer. We used our own dedicated ``ERNSt`` endstation at BESSY II, which is by purpose a reflectometer and therefore capable of very precise angle dependent measurements, so we are in the rare position to separate rotatable from non-rotatable magnetic moments in the antiferromagnet of the exchange bias system. We present here Fe based XMCD sum rule results. We surprisingly found a different field dependent behavior between spin and orbital moments. While the rotatable moments are spin dominated, the non-rotatable magnetic moments are of nearly pure orbital character. We also estimated the effective rotatable and pinned moment thicknesses at the interface. The founding in this very special system shows a way to a much broader impact for many magnetic systems.