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arXiv 1306.5990cond-mat.stat-mechcond-mat.mtrl-sci
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薄膜中巴克豪森噪声的普适类和交叉标度

Universality classes and crossover scaling of Barkhausen noise in thin films

Lasse Laurson, Gianfranco Durin, Stefano Zapperi

摘要:

我们研究了无序铁磁薄膜中头对头畴壁分离面内畴的动力学。畴壁表面张力和偶极相互作用之间的竞争诱导在短的长度尺度和大规模的阶段,其中壁显示锯齿形形态的粗糙畴壁相之间的交叉。这两个阶段的特征在于不同的临界指数巴克豪森雪崩动力学,在定量协议与实验测量MnAs薄膜。

英文摘要:

We study the dynamics of head-to-head domain walls separating in-plane domains in a disordered ferromagnetic thin film. The competition between the domain wall surface tension and dipolar interactions induces a crossover between a rough domain wall phase at short length-scales and a large-scale phase where the walls display a zigzag morphology. The two phases are characterized by different critical exponents for Barkhausen avalanche dynamics that are in quantitative agreement with experimental measurements on MnAs thin films.

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