Domain Wall Motion in Thin-Film Magnets/ Topological Insulator Junctions

Abstract

We derive the equations of motion of a Domain Wall in a thin-film magnet coupled to the surface states of a Topological Insulator in the presence of of both an electric field along the Domain Wall and a magnetic field perpendicular to the junction. We show how the electric field acts as a chirality stabilizer holding off the appearance of Walker breakdown and enhancing the terminal velocity. We also propose a mechanism to reverse the Domain Wall chirality in a controllable manner by tuning the chiral current flowing through the Wall. An input from a weak perpendicular magnetic field is required in order to break the reflection symmetry that protects the degeneracy of the chirality vacuum.

Enlarged and revised version accepted in PRB

References in corpus (3)

• Microscopic approach to current-driven domain wall dynamics
• Thin-Film Magnetization Dynamics on the Surface of a Topological Insulator
• Topological charge pumping effect by the magnetization dynamics on the Surface of Three-Dimensional Topological Insulators

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• Dirac electrons and domain walls: a realization in junctions of ferromagnets and topological insulators
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• Experimental demonstration of a magnetically induced warping transition in a topological insulator mediated by rare-earth surface dopants
• Chiral Hall effect in the kink states in topological insulators with magnetic domain walls
• Topological magnetic dipolar interaction and non-local electric magnetization control in topological insulator heterostructures
• Transport of Dirac electrons in a random magnetic field in topological heterostructures
• Nonlinear chiral photocurrent in parity-violating magnetic Weyl semimetals
• Topological staggered field-electric effect with bipartite magnets
• Probing domain wall dynamics in magnetic Weyl semimetals via the non-linear anomalous Hall effect
• Chiral electronic network within skyrmionic lattice on topological insulator surfaces