SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Magnetic Instrumentation and Characterization
MA 48.4: Vortrag
Freitag, 31. März 2023, 10:15–10:30, HSZ 401
XMCD in fluorescence-yield mode can measure the spin-orbit torque switching of both rare-earth and transition-metal sublattices in mesoscale devices of GdFe3 thin films — •James M Taylor1,2, Chen Luo1,2, Victor Ukleev1, Christian H Back2, and Florin Radu1 — 1Helmholtz-Zentrum Berlin for Materials and Energy, 12489 Berlin, Germany — 2Department of Physics, Technical University of Munich, 85748 Garching, Germany
Ferrimagnets containing one rare-earth and one transition-metal sublattice are of interest both for future spintronic devices and as sandbox materials for exploring ultrafast magnetism. In regard to the latter, ferrimagnetic Gd+Fe has been widely studied, due to its demonstration of all-optical switching (AOS). On the other hand, more interesting for technological applications is current-induced magnetization reversal driven by spin-orbit torques (SOTs). To fully understand SOT switching in ferrimagnets, it is important, as with AOS, to look at the respective behaviour of both sublattices. In this work, we take a step towards making such measurements more readily available: by using conventional, static x-ray magnetic circular dichroism (XMCD) operated in fluorescence-yield mode to measure the relative responses of the Gd and Fe sublattices during an SOT switching process. This was performed using sub-ms current pulses in µm-sized devices fabricated from GdFe3 heterostructures down to 10 nm thick, in-situ in the VEKMAG beamline at the BESSY II synchrotron. We compare this with electrical detection of the switching using simultaneous anomalous Hall effect measurements, which follow the Fe sublattice, as expected.