DOMAIN-WALL DYNAMIC INSTABILITY

被引:12
|
作者
YUAN, SW
BERTRAM, HN
机构
[1] Center for Magnetic Recording Research, University of California, San Diego
基金
美国国家科学基金会;
关键词
D O I
10.1063/1.347853
中图分类号
O59 [应用物理学];
学科分类号
摘要
Computer simulation is utilized to follow the dynamic evolution of a one-dimensional Bloch domain wall. The Landau-Lifshitz equation with Gilbert damping is solved with the applied field along the domain magnetization. Walker's solution is verified for the case where the anisotropy field is much larger than the Walker critical field. When the critical field is comparable to the anisotropy field, the wall motion exhibits instability. For an external field lower than the Walker critical field, after some transient behavior, the steady-state Walker-type wall configuration is reached; when the applied field is above the Walker limit, the initial single wall gradually evolves into an odd number of Bloch walls with consecutively opposite senses. Wall motions for soft ferrite material with different dampings are also investigated. For very small damping the stability holds well. However, for medium damping, it is found that below some critical field, smaller than Walker's, the steady-state solution is stable. Above that field, the single wall first develops a frontal wake which enlarges until instability when an odd number of walls form.
引用
收藏
页码:5874 / 5876
页数:3
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