Macrospin Models of Spin Transfer Dynamics

Details Macrospin Models of Spin Transfer Dynamics Macrospin Models of Spin Transfer Dynamics

2005-04-06

arxiv.org/abs/cond-mat/0504142v1

Physical Review B. Vol 72, 014446(2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 14 figures. Email andrew.zangwill@physics.gatech.edu for a pdf with higher quality figures

Scientific paper

10.1103/PhysRevB.72.014446

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.

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