A MEAN-FIELD MODEL FOR SPIN DYNAMICS IN MULTILAYERED FERROMAGNETIC MEDIA

被引：10

作者：

Chen, Jingrun ^{[1
]}

Garcia-Cervera, Carlos J. ^{[1
]}

Yang, Xu ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Math, Santa Barbara, CA 93106 USA

来源：

MULTISCALE MODELING & SIMULATION | 2015年 / 13卷 / 02期

基金：

美国国家科学基金会;

关键词：

spin-transfer torque; spin-magnetization coupling; moment closure; magnetization reversal; BOLTZMANN-EQUATION; BLOCH EQUATION; DOMAIN-WALL; LIMIT; SPINTRONICS; RESONANCE; TORQUES; SYSTEM;

D O I：

10.1137/140953149

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

In this paper, we develop a mean-field model for describing the dynamics of spin-transfer torque in multilayered ferromagnetic media. Specifically, we use the techniques of Wigner transform and moment closure to connect the underlying physics at different scales and reach a macroscopic model for the dynamics of spin coupled with the magnetization within the material. This provides a further understanding of the linear response model proposed by Zhang, Levy, and Fert [Phys. Rev. Lett., 88 (2002), 236601], and in particular we get an extra relaxation term which helps to stabilize the system. We develop efficient numerical methods to overcome the stiffness appearing in this new mean-field model and present several examples to analyze and show its validity.

引用

页码：551 / 570

页数：20

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