Theory of current-driven dynamics of spin textures on a surface of topological insulators

Abstract

Spin-transfer torque is one of the important physical quantities to understand for successful application of topological insulators to spintronics. In this paper, we present analytical expressions of the spin-transfer torques on a surface of a magnetic topological insulator by including the higher-order contributions of momentum, $k^2$-term and the hexagonal warping. We obtain six different types of the spin-transfer torque including both the field-like and the damping-like torques; the four of them appear only when the higher-order momentum contributions are included. In addition, we discuss the dynamics of magnetic skyrmions driven by the spin-transfer torques on the surface of the topological insulator. Unlike the skyrmion dynamics in conventional metals, we find that the dynamics significantly depends on the internal structure of magnetic textures.

arXiv comment8 pages, 3 figures

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Cited by in corpus (19)

• Spin and spin current -- From fundamentals to recent progress
• Spin-orbit torque for field-free switching in C_{3v} crystals
• Spin-dependent transport through a Weyl semimetal surface
• Anisotropic linear and nonlinear charge-spin conversion in topological semimetal SrIrO3
• Topological nature of the proper spin current and the spin-Hall torque
• Spin-Hall effect due to the bulk states of topological insulators: Extrinsic contribution to the conserved spin current
• Spin transfer torques due to the bulk states of topological insulators
• Spin-orbit torques from topological insulator surface states: Effect of extrinsic spin-orbit scattering on an out-of-plane magnetization
• Non-linear antidamping spin-orbit torque originating from intra-band transport on the warped surface of a topological insulator
• Intrinsic torques emerging from anomalous velocity in magnetic textures
• Skyrmion spin transfer torque due to current confined in a nanowire
• Giant orbital Hall effect due to the bulk states of 3D topological insulators
• Skyrmion nucleation on the surface of a topological insulator
• Torque field and skyrmion movement by spin transfer torque in a quasi-2d interface in presence of strong spin-orbit interaction
• Mixed topology ring states for Hall effect and orbital magnetism in skyrmions of Weyl semimetals
• Spin-orbit torques due to topological insulator surface states: an in-plane magnetization as a probe of extrinsic spin-orbit scattering
• Giant resonant skew scattering of plasma waves in a two-dimensional electron gas
• Spin-valve effect for spin-polarized surface states in topological semimetals
• Chiral electronic network within skyrmionic lattice on topological insulator surfaces