Spin torques and anomalous velocity in spin textures induced by fast electron injection from topological ferromagnets: The role of gauge fields

Abstract

A new method for analysing magnetization dynamics in spin textures under the influence of fast electron injection from topological ferromagnetic sources such as Dirac half metals has been proposed. These electrons, traveling at a velocity $v$ with a non-negligible value of $v/c$ (where c is the speed of light), generate a non-equilibrium magnetization density in the spin-texture region, which is related to an electric dipole moment via relativistic interactions. When this resulting dipole moment interacts with gauge fields in the spin-texture region, an effective field is created that produces spin torques. These torques, like spin-orbit torques that occur when electrons are injected from a heavy metal into a ferromagnet, can display both damping-like and anti-damping-like properties. Finally, we demonstrate that such an interaction between the dipole moment and the gauge field introduces an anomalous velocity that can contribute to transverse electrical conductivity in the spin texture in a way comparable to the topological Hall effect.

References in corpus (20)

• Magnetic switching by spin torque from the spin Hall effect
• Direct electronic measurement of the spin Hall effect
• Mechanisms of spin-polarized current-driven magnetization switching
• Topological Hall effect and Berry phase in magnetic nanostructures
• Skyrmions in Magnetic Multilayers
• Current induced torques and interfacial spin-orbit coupling: Semiclassical Modeling
• Progress and prospects in magnetic topological materials
• Magnetic texture based magnonics
• Colloquium: Nonequilibrium effects in superconductors with a spin-splitting field
• Current-induced domain wall motion in Rashba spin-orbit system
• Anomalous Hall Effect and Skyrmion Number in Real- and Momentum-space
• Trouble with the Lorentz law of force: Incompatibility with special relativity and momentum conservation
• Effective gauge field theory of spintronics
• Drift-induced Unidirectional Graphene Plasmons
• Dirac half-metal in a triangular ferrimagnet
• Locking of skyrmion cores on a centrosymmetric discrete lattice: onsite versus offsite
• Spin torques and magnetic texture dynamics driven by the supercurrent in superconductor/ferromagnet structures
• Mansuripur's Paradox
• Spin-Transfer and Exchange Torques in Ferromagnetic Superconductors
• Unified theory of magnetization dynamics with relativistic and nonrelativistic spin torques