Topological spin-transfer drag driven by skyrmion diffusion
arXiv:1605.02857 · doi:10.1103/PhysRevB.94.024431
Abstract
We study the spin-transfer drag mediated by the Brownian motion of skyrmions. The essential idea is illustrated in a two-terminal geometry, in which a thin film of a magnetic insulator is placed in between two metallic reservoirs. An electric current in one of the terminals pumps topological charge into the magnet via a spin-transfer torque. The charge diffuses over the bulk of the system as stable skyrmion textures. By Onsager's reciprocity, the topological charge leaving the magnet produces an electromotive force in the second terminal. The voltage signal decays algebraically with the separation between contacts, in contrast to the exponential suppression of the spin drag driven by non-protected excitations like magnons. We show how this topological effect can be used as a tool to characterize the phase diagram of chiral magnets and thin films with interfacial Dzyaloshinskii-Moriya interactions.
8 pages, 3 figures; final version to appear in Physical Review B
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- Topological Transport of Vorticity in Heisenberg Magnets
- Nonlocal Spin Transport Mediated by a Vortex Liquid in Superconductors
- Perspective: (Beyond) spin transport in insulators
- Quantum Hydrodynamics of Vorticity
- Hydrodynamics of three-dimensional skyrmions in frustrated magnets
- Stabilization of the skyrmion crystal phase in thin-film antiferromagnets
- Magnetoelectric antiferromagnets as platforms for the manipulation of solitons
- Energy storage in magnetic textures driven by vorticity flow
- Gyrotropic elastic response of skyrmion crystals to current-induced tensions
- Biasing topological charge injection in topological matter