Dynamics of a ferromagnetic domain wall and the Barkhausen effect

被引：104
|
作者：
Cizeau, P
Zapperi, S
Durin, G
Stanley, HE
机构：
[1] BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215
[2] IST ELETTROTECNICO NAZL GALILEO FERRARIS,I-10125 TURIN,ITALY
[3] INFM,GNSM,I-10125 TURIN,ITALY
来源：
PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 23期
关键词：
D O I：
10.1103/PhysRevLett.79.4669
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We derive an equation of motion for the dynamics of a ferromagnetic domain wall driven by an external magnetic field through a disordered medium, and we study the associated depinning transition. The long-range dipolar interactions set the upper critical dimension to be d(c) = 3, so we suggest that mean-field exponents describe the Barkhausen effect for three-dimensional soft ferromagnetic materials. We analyze the scaling of the Barkhausen jumps as a function of the field driving rate and the intensity of the demagnetizing field, and find results in quantitative agreement with experiments on crystalline and amorphous soft ferromagnetic alloys.
引用
收藏
页码：4669 / 4672
页数：4
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