Macrospin Models of Spin Transfer Dynamics
摘要
The current-induced magnetization dynamics of a spin valve are studied using a macrospin (single domain) approximation and numerical solutions of a generalized Landau-Lifshitz-Gilbert equation. For the purpose of quantitative comparison with experiment [Kiselev {\it et al.} Nature {\bf 425}, 380 (2003)], we calculate the resistance and microwave power as a function of current and external field including the effects of anisotropies, damping, spin-transfer torque, thermal fluctuations, spin-pumping, and incomplete absorption of transverse spin current. While many features of experiment appear in the simulations, there are two significant discrepancies: the current dependence of the precession frequency and the presence/absence of a microwave quiet magnetic phase with a distinct magnetoresistance signature. Comparison is made with micromagnetic simulations designed to model the same experiment.
引用
@article{arxiv.cond-mat/0504142,
title = {Macrospin Models of Spin Transfer Dynamics},
author = {Jiang Xiao and A. Zangwill and M. D. Stiles},
journal= {arXiv preprint arXiv:cond-mat/0504142},
year = {2009}
}
备注
14 pages, 14 figures. Email [email protected] for a pdf with higher quality figures