SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.12: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Magnetization dynamics in magnetic trilayers with a wedged antiferromagnetic spacer layer at ultrafast timescales — •Jendrik Gördes1, Ivar Kumberg1, Chowdhury Awsaf1, Rahil Hosseinifar1, Marcel Walter1, Tauqir Shinwari1, Sangeeta Thakur1, Christian Schüßler-Langeheine2, Niko Pontius2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin
We studied the time-resolved magnetization dynamics of an epitaxially grown heterostructure comprised of an antiferromagnetic (AFM) Mn wedge sandwiched between two ferromagnetic (FM) Co layers on Cu(001). The two FM layers were coupled indirectly by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction and directly exchange coupled through the AFM spin structure, leading to parallel or antiparallel alignment of the FM layers, depending on the Mn thickness [1]. Deposition of Mn in a wedge allowed for access to different coupling regimes on the same sample. Magnetization dynamics were observed after excitation with 800 nm laser pulses by X-ray magnetic circular dichroism (XMCD) in resonant soft X-ray reflectivity. We point out the effect an antiferromagnetic spacer layer has on the magnetization dynamics of the FM layers.
[1] Bin Zhang et al., J. Appl. Phys. 115, 233915 (2014)