Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.29: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Asymmetric spin wave dispersion relation due to interfacial Dzyaloshinskii-Moriya interaction — •Helmut Körner1, Johannes Stigloher1, Hans Bauer1, Hiroshi Hata2, Takuya Taniguchi2, Takahiro Moriyama2, Teruo Ono2, and Christian Back1 — 1Department of Physics, Regensburg University, 93053 Regensburg, Germany — 2Laboratory of Nano Spintronics, Division of Materials Chemistry, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
The interfacial Dzyaloshinskii-Moriya interaction (DMI) has attracted much attention lately due to its possible usage in future spintronic devices. It occurs in any trilayer structure when the first nonmagnetic layer provides spin-orbit coupling, the middle layer is a ferromagnet, and the third layer is nonmagnetic, but different from the first layer to break symmetry.
In our experiment, we study propagating magnetostatic spin waves in the Damon-Eshbach geometry by means of time-resolved scanning Kerr microscopy in 70 µm wide Ta(2)/Pt(2)/Co(0.4)/Py(5)/MgO(5) stripes. Due to the DMI present at the Pt/Co interface, an asymmetry in the spin wave dispersion relation is expected with respect to both their propagation direction and the equilibrium magnetization direction [1,2]. From the observed asymmetry in the shift in the wave-vector amplitude we can quantify the DMI in our system.
[1] J.-H. Moon et al., Phys. Rev. B 88, 184404 (2013), [2] M. Kostylev, J. Appl. Phys. 115, 233902 (2014)