Barkhausen avalanches in anisotropic ferromagnets with $180^{\circ }$ domain walls

Abstract

We show that Barkhausen noise in two-dimensional disordered ferromagnets with extended domain walls is characterized by the avalanche size exponent ${\tau }_s=1.54$ 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 ${\tau }_s=1.30$. 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.

Changes in the text and references, To appear in Phys. Rev. E

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