Transmission electron microscopy techniques are used to characterize the development of the polytwinned microstructures during Al → Ll0 ordering in FePd and FePt alloys. Also, Lorentz microscopy methods are used to image the magnetic domain structures which are associated with these magnetically modulated twin assemblies. A modified APB pinning model including thermally activated wall motion is formulated to account for the levels of coercivity and the temperature dependence of the coercivity in polytwinned ferromagnets.
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Zhang et al. (1992) studied this question.
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