Abstract
The theory of shock-induced demagnetization produced by strain-induced magnetic anisotropy is considered in cubic polycrystalline ferromagnetic material. Analysis of the averaging procedure required to predict the polycrystalline behavior reveals the importance of magnetic grain interaction. Magnetization curves for extreme assumptions of interacting grains and independent grains are determined. Experimental shock demagnetization data are obtained for polycrystalline yttrium iron garnet in the region of large elastic strain (approximately ⅓ and ⅔ of the Hugoniot elastic limit). Results support the independent grain assumption.
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