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arXiv · 1805.01838

Spin wave effects in transport between a ferromagnet and a Weyl semimetal surface

A. Kononov·O. O. Shvetsov·A. V. Timonina·N. N. Kolesnikov·E. V. Deviatov
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Abstract

We experimentally investigate spin-polarized transport between a ferromagnetic Ni electrode and a surface of Weyl semimetal, realized in a thick WTe$_2$ single crystal. For highly-transparent Ni-WTe$_2$ planar junctions, we observe non-Ohmic $dV/dI(I)$ behavior with an overall increase of differential resistance $dV/dI$ with current bias, which is accomplished by current-induced switchings. This behavior is inconsistent with trivial interface scattering, but it is well known for spin-polarized transport with magnon emission. Thus, we interpret the experimental results in terms of spin wave excitation in spin textures in the WTe$_2$ topological surface states, which is supported by the obtained magnetic field and temperature $dV/dI(I)$ dependencies.

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A. Kononov, O. O. Shvetsov, A. V. Timonina, N. N. Kolesnikov, E. V. Deviatov. 2018-05-04. Spin wave effects in transport between a ferromagnet and a Weyl semimetal surface. https://doi.org/10.1134/s0021364019030020

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