Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 54: Spin: Transport, Orbitronics and Hall Effects II
MA 54.9: Talk
Thursday, March 19, 2020, 17:15–17:30, HSZ 403
Origin of the Magnetic Spin Hall Effect: Spin Current Vorticity in the Fermi Sea — •Alexander Mook1, Robin Richard Neumann2, Annika Johansson2, Jürgen Henk2, and Ingrid Mertig2,3 — 1Department of Physics, University of Basel, CH-4056 Basel — 2Institut für Physik, Martin-Luther-Universität, D-06120 Halle — 3Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle
The interplay of spin-orbit coupling and magnetism gives rise to a plethora of charge-to-spin conversion phenomena that harbor great potential for spintronics applications. In particular, in addition to the spin Hall effect, magnets may exhibit a magnetic spin Hall effect [1,2].
Herein [3], we unveil the origin of the magnetic spin Hall effect and connect it to the spin current vorticity, i.e., to the tendency of the spin current to rotate, shear or curve in reciprocal space. This suggests the following illustrative explanation: Magnetic materials feature spin current whirlpools (or vortices) in reciprocal space for each of the three spin directions. Similar to water whirlpools (in real space), whose handedness leads to an asymmetric deflection of plane water waves, the spin current whirlpools (in reciprocal space) cause an asymmetric deflection of the respective spin components.
[1] J. Železný et al., Phys. Rev. Lett. 119, 187204 (2017); [2] M. Kimata et al., Nature 565, 627-630 (2019); [3] A. Mook, R. R. Neumann, A. Johansson, J. Henk, and I. Mertig, preprint arXiv:1910.13375