Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Thin Films: Magnetic Coupling Phenomena / Exchange Bias / Magnetic Anisotropy
MA 22.4: Vortrag
Mittwoch, 7. September 2022, 10:15–10:30, H47
XMCD investigation on Sm-Co magnetic thin films: strong orbital pinning on Co and the role of Sm — •Damian Günzing1, Georgia Gkouzia2, Ruiwen Xie2, Teresa Wessels1, Hongbin Zhang2, Lambert Alff2, Alpha T. N’Diaye3, Heiko Wende1, and Katharina Ollefs1 — 1Faculty of Physics, University of Duisburg-Essen — 2Institute of Materials Science, Technical University of Darmstadt — 3Advanced Light Source, Lawrence Berkeley National Lab Berkeley
We present the investigation of crystalline Sm-Co thin films manufactured via MBE on an Al2O3 substrate without additional buffer layers [1] by soft X-ray magnetic circular dichroism (XMCD). We use XMCD to investigate the element-specific spin and orbital moments of the individual elements, here Sm and Co. Often, with soft X-rays only the first few nm are probed via electron yield detection, leading to significant surface effects. In contrast, here, we use the luminescence of the substrate and are able to study the entire sample over the whole film thickness. We see a surprisingly strong orbital pinning on the Co sites in applied fields up to 2T. From element-specific hysteresis curves we find that the Sm atoms are coupled to Co, but with spectroscopic features saturating different in high fields. We compare the experimental results obtained by XMCD with multiplet calculations using Quanty, which suggest an exchange field present at the Sm site. (Financially supported by the DFG Project-ID 405553726*CRC 270). [1] S. Sharma et al., ACS Appl. Mater. Interfaces (2021) 13, 27, 32415-32423