We experimentally investigate electron transport in kagome-lattice ferromagnet Co3Sn2S2, which is regarded as a time-reversal symmetry broken Weyl semimetal candidate. We demonstrate dV/dI(I) curves with pronounced asymmetric dV/dI spikes, similar to those attributed to current-induced spin-wave excitations in ferromagnetic multilayers. In contrast to multilayers, we observe several dV/dI spikes' sequences at low, ≈104 A/cm2, current densities for a thick single-crystal Co3Sn2S2 flake in the regime of fully spin-polarized bulk. The spikes at low current densities can be attributed to novel magnon branches in magnetic Weyl semimetals, which are predicted due to the coupling between two magnetic moments mediated by Weyl fermions. Presence of spin-transfer effects at low current densities in Co3Sn2S2 makes the material attractive for applications in spintronics.
@article{arxiv.1904.07762,
title = {Multiple magnon modes in the Co$_3$Sn$_2$S$_2$ Weyl semimetal candidate},
author = {O. O. Shvetsov and V. D. Esin and A. V. Timonina and N. N. Kolesnikov and E. V. Deviatov},
journal= {arXiv preprint arXiv:1904.07762},
year = {2019}
}