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

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

1999-03-05

arxiv.org/abs/cond-mat/9903090v2

Phys. Rev. E 61, 4610 (2000)

Physics

Condensed Matter

Statistical Mechanics

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

Scientific paper

10.1103/PhysRevE.61.4610

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.

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