We present a model for the study of the hysteretic behavior of a disordered ferromagnetic system with an array of parallel Bloch domain walls. We write the equations of motion of the walls under an external magnetic field driving, considering long-range dipolar interactions and disorder. We calculate analytically an expression for the magnetic susceptivity χ, and find a logarithmic dependence for χ on the number of domains. We study the dynamic hysteresis, which behavior could be explained by the theory of loss separation.
Dipolar interactions in ferromagnetic systems: Dynamic hysteresis from parallel domain walls / B. Cerruti, S. Zapperi, G. Durin. - In: PHYSICA. B, CONDENSED MATTER. - ISSN 0921-4526. - 403:2-3(2008 Feb 01), pp. 422-424. ((Intervento presentato al 6. convegno International Symposium on Hysteresis and Modeling Micromagnetics tenutosi a Napoli nel 2007.
Dipolar interactions in ferromagnetic systems: Dynamic hysteresis from parallel domain walls
S. Zapperi;
2008
Abstract
We present a model for the study of the hysteretic behavior of a disordered ferromagnetic system with an array of parallel Bloch domain walls. We write the equations of motion of the walls under an external magnetic field driving, considering long-range dipolar interactions and disorder. We calculate analytically an expression for the magnetic susceptivity χ, and find a logarithmic dependence for χ on the number of domains. We study the dynamic hysteresis, which behavior could be explained by the theory of loss separation.
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