Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics
Abstract
A phenomenological equation called Landau-Lifshitz-Baryakhtar (LLBar) equation, which could be viewed as the combination of Landau-Lifshitz (LL) equation and an extra "exchange damping" term, was derived by Baryakhtar using Onsager's relations. We interpret the origin of this "exchange damping" as nonlocal damping by linking it to the spin current pumping. The LLBar equation is investigated numerically and analytically for the spin wave decay and domain wall motion. Our results show that the lifetime and propagation length of short-wavelength magnons in the presence of nonlocal damping could be much smaller than those given by LL equation. Furthermore, we find that both the domain wall mobility and the Walker breakdown field are strongly influenced by the nonlocal damping.
Keywords
Cite
@article{arxiv.1508.01478,
title = {Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics},
author = {Weiwei Wang and Mykola Dvornik and Marc-Antonio Bisotti and Dmitri Chernyshenko and Marijan Beg and Maximilian Albert and Arne Vansteenkiste and Bartel V. Waeyenberge and Andriy N. Kuchko and Volodymyr V. Kruglyak and Hans Fangohr},
journal= {arXiv preprint arXiv:1508.01478},
year = {2015}
}
Comments
10 pages, 6 figures