Multiple magnon modes in the Co${}_3$Sn${}_2$S${}_2$ Weyl semimetal candidate

Abstract

We experimentally investigate electron transport in kagome-lattice ferromagnet Co${}_3$Sn${}_2$S${}_2$, 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, $\approx$10${}^4$ A/cm${}^2$, current densities for a thick single-crystal Co${}_3$Sn${}_2$S${}_2$ 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 Co${}_3$Sn${}_2$S${}_2$ makes the material attractive for applications in spintronics.

arXiv commentfinal version

References in corpus (19)

• Anomalous Hall effect
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
• Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Berry Curvature on the Fermi Surface: Anomalous Hall Effect as a Topological Fermi-Liquid Property
• Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2
• Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions
• The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi
• Chiral gauge field and axial anomaly in a Weyl semi-metal
• Current-induced spin-wave excitations in a single ferromagnetic layer
• Spin Texture in Type-II Weyl Semimetal WTe2
• Canted antiferromagnetic phase in a double quantum well in a tilted quantizing magnetic field
• Signature of Fermi arc surface states in Andreev reflection at the WTe${}_2$ Weyl semimetal surface
• Surface superconductivity in a three-dimensional Cd${}_3$As${}_2$ semimetal
• Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals
• Weyl fermions induced Magnon electrodynamics in Weyl semimetal
• Spin dynamics in point contacts to single ferromagnetic films

Cited by in corpus (10)

• Spin-dependent transport through a Weyl semimetal surface
• Gate-dependent non-linear Hall effect at room temperature in topological semimetal GeTe
• Josephson spin-valve realization in the magnetic nodal-line topological semimetal Fe${}_3$GeTe${}_2$
• Band gap reconstruction at the interface between black phosphorus and a gold electrode
• Evidence for surface spin structures from first order reversal curves in Co3Sn2S2 and Fe3GeTe2 magnetic topological semimetals
• Magnetically stable zero-bias anomaly in Andreev contact to the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Second-harmonic response as a tool to detect spin textures in magnetic nodal-line semimetal Fe${}_3$GeTe${}_2$
• Second-harmonic voltage responce for the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Magnon modes as a joint effect of surface ferromagnetism and spin-orbite coupling in CoSi chiral topological semimetal
• Spin-valve effect for spin-polarized surface states in topological semimetals