Year: 2007
Type: article
Abstract: Starting from the stochastic Landau-Lifschitz-Gilbert equation, we derive Langevin equations that describe the nonzero-temperature dynamics of a rigid domain wall. We derive an expression for the average drift velocity of the domain wall $⟨{\stackrel{\ifmmode \dot{}\else \textperiodcentered \fi{}}{r}}_{\mathrm{dw}}⟩$ as a function of the applied current, and find qualitative agreement with recent magnetic semiconductor experiments. Our model implies that at any nonzero-temperature $⟨{\stackrel{\ifmmode \dot{}\else \textperiodcentered \fi{}}{r}}_{\mathrm{dw}}⟩$ initially varies linearly with current, even in the absence of nonadiabatic spin torques.
Source: Physical Review Letters
Authors: R. A. Duine, A. S. Núñez, A. H. MacDonald
Institutions: Utrecht University, The University of Texas at Austin
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2076511954