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Theory of Hysteresis Loop in Ferromagnet

Igor F. Lyuksyutov·Thomas Nattermann·Valery Pokrovsky
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Abstract

A theory of the hysteresis loop in ferromagnets controlled by the domain wall motion is presented. Domain walls are considered as plane or linear interfaces moving in a random medium under the action of the external ac magnetic field $H=H_0\sinωt$. We introduce important characteristics of the hysteresis loop, such as dynamic threshold fields, reversal field etc. together with well known characteristics as coercive field and hysteresis loop area (HLA) $\cal A$. We show that all these characteristics are regulated by two dimensionless combinations of the $H_0$ and $ω$and intrinsic characteristics of the ferromagnet. The moving domain wall can create magnetic bubbles playing the role of pre-existing nuclei of the reversed magnetization. We discuss a simple model of this process. For magnetization reversal determined by domain inflation we predict that HLA scales as ${\cal A}\propto ω^βH_0^α$ with $α=1/2$ and $β=1/2$. Numerical simulations confirmthis result.

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Igor F. Lyuksyutov, Thomas Nattermann, Valery Pokrovsky. 1997-09-20. Theory of Hysteresis Loop in Ferromagnet. https://arxiv.org/abs/cond-mat/9709194

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