Droplet nucleation and domain wall motion in a bounded interval

被引:42
作者
Maier, RS [1 ]
Stein, DL
机构
[1] Univ Arizona, Dept Math, Tucson, AZ 85721 USA
[2] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
关键词
D O I
10.1103/PhysRevLett.87.270601
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study a spatially extended model of noise-induced magnetization reversal: a classical Ginzburg-Landau model, restricted to a bounded interval and perturbed by weak spatiotemporal noise. By adapting the Coleman-Langer approach to false vacuum decay, we determine the dependence of the activation barrier and Kramers rate prefactor on the interval length. As it increases, a transition between activation regimes occurs, at which the prefactor diverges. Similar transitions between activation regimes should occur in many other bistable, spatially extended classical models.
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页数:4
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