Topological spin transport by Brownian diffusion of domain walls

Abstract

We propose thermally-populated domain walls (DWs) in an easy-plane ferromagnetic insulator as robust spin carriers between two metals. The chirality of a DW, which serves as a topological charge, couples to the metal spin accumulation via spin-transfer torque and results in the chirality-dependent thermal nucleation rates of DWs at the interface. After overpopulated DWs of a particular (net) chirality diffuse and leave the ferromagnet at the other interface, they reemit the spin current by spin pumping. The conservation of the topological charge supports an algebraic decay of spin transport as the length of the ferromagnet increases; this is analogous to the decaying behavior of superfluid spin transport but contrasts with the exponential decay of magnon spin transport. We envision that similar spin transport with algebraic decay may be implemented in materials with exotic spin phases by exploiting topological characteristics and the associated conserved quantities of their excitations.

5 pages + references, 4 figures

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Cited by in corpus (23)

• Antiferromagnetic spintronics
• Breaking of Galilean invariance in the hydrodynamic formulation of ferromagnetic thin films
• Magnetic Domain Walls as Hosts of Spin Superfluids and Generators of Skyrmions
• Generalized Boundary Conditions for Spin Transfer
• Symmetry-broken dissipative exchange flows in thin-film ferromagnets with in-plane anisotropy
• Topological transport of deconfined hedgehogs in magnets
• Energy Storage via Topological Spin Textures
• Topological Transport of Vorticity in Heisenberg Magnets
• Nonlocal Spin Transport Mediated by a Vortex Liquid in Superconductors
• Perspective: (Beyond) spin transport in insulators
• Topological spin-transfer drag driven by skyrmion diffusion
• Quantum Hydrodynamics of Vorticity
• Local thermomagnonic torques in two-fluid spin dynamics
• Hydrodynamics of three-dimensional skyrmions in frustrated magnets
• Quantum hydrodynamics of spin winding
• Annihilation of topological solitons in magnetism with spin wave burst finale: The role of nonequilibrium electrons causing nonlocal damping and spin pumping over ultrabroadband frequency range
• Hydrodynamic description of long-distance spin transport through noncollinear magnetization states: the role of dispersion, nonlinearity, and damping
• Perspectives on spin hydrodynamics in ferromagnetic materials
• Spin superfluidity in noncollinear antiferromagnets
• Anatomy of spin wave driven magnetic texture motion via magnonic torques
• Dynamics of metastable contact soliton dissipative exchange flows in one-dimensional ferromagnetic channels
• Nonreciprocal superfluidlike topological spin transport
• Current-driven dynamics of antiferromagnetic domain-wall skyrmions