Origin of adiabatic and non-adiabatic spin transfer torques in current-driven magnetic domain wall motion

Abstract

A consistent theory to describe the correlated dynamics of quantum mechanical itinerant spins and semiclassical local magnetization is given. We consider the itinerant spins as quantum mechanical operators, whereas local moments are considered within classical Lagrangian formalism. By appropriately treating fluctuation space spanned by basis functions, including a zero-mode wave function, we construct coupled equations of motion for the collective coordinate of the center-of-mass motion and the localized zero-mode coordinate perpendicular to the domain wall plane. By solving them, we demonstrate that the correlated dynamics is understood through a hierarchy of two time scales: Boltzmann relaxation time when a non-adiabatic part of the spin-transfer torque appears, and Gilbert damping time when adiabatic part comes up.

4 pages, 2 figures

References in corpus (6)

• Microscopic approach to current-driven domain wall dynamics
• Spin Transfer Torque for Continuously Variable Magnetization
• Theory of spin current in chiral helimagnet
• Spin-wave contributions to current-induced domain wall dynamics
• Transport magnetic currents driven by moving kink crystal in chiral helimagnets
• Hidden Galilean symmetry, conservation laws and emergence of spin current in the soliton sector of chiral helimagnet

Cited by in corpus (5)

• Antiferromagnetic Domain Wall Motion Induced by Spin Waves
• Coherent sliding dynamics and spin motive force driven by crossed magnetic fields in chiral helimagnet
• Thermal gradient driven domain wall dynamics
• AC magnetic response of highly nonlinear soliton lattice in a monoaxial chiral helimagnet
• Unidirectional gliding of a cycloidal spin structure by an AC magnetic field