Barkhausen avalanches in anisotropic ferromagnets with 180° domain walls

被引：0
|
作者：
Tadić, Bosiljka [1 ]
Nowak, Ulrich [2 ]
机构：
[1] Jožef Stefan Institute, P.O. Box 3000, Ljubljana,1001, Slovenia
[2] Theoretische Tieftemperaturphysik, Gerhard-Mercator-Universität-Duisburg, Duisburg,D-47048, Germany
来源：
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | 2000年 / 61卷 / 04期
关键词：
Anisotropy - Ferromagnetic materials - Iron compounds - Ferromagnetism - Magnets - Boron compounds - Cobalt compounds;
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摘要：
We show that Barkhausen noise in two-dimensional disordered ferromagnets with extended domain walls is characterized by the avalanche size exponent τs = 1.54 at low disorder. With increasing disorder the characteristic domain size is reduced relative to the system size due to nucleation of new domains and a dynamic phase transition occurs to the scaling behavior with τs = 1.30. The exponents decrease at finite driving rate. The results agree with recently observed behavior in amorphous Metglas and Fe-Co-B ribbons when the applied anisotropic stress is varied. © 2000 The American Physical Society.
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页码：4610 / 4613
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