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Coercivity vanishing induced by soft imperfections in hard magnetic materials
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DOI：10.1142/S0217984926410010.png)
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Abstract
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Coercivity of hard magnetic material with soft imperfection was studied via micromagnetic simulations established on one-dimensional scheme. A transition region of anisotropy energy between soft and hard phases was involved by considering a power function of Ku(x)proportional to xn with n varied from 0.5 to 3.0. Unlike the sharp-interface connection, where a lower bound of coercivity exists, the presence of Ku transition led the coercivity reduction unbounded. The quadratic case (n=2.0) showed the steepest drop of coercivity when transition region is considerably thick, following a simple inverse law as hc=lt-1 with hc the coercivity normalized by anisotropy field and lt the transition thickness normalized by Bloch length. The magnetic reversals and the behaviors of thermal agitation were explored for various n cases, and correlated to the energy profiles investigated by calculation of minimum energy paths.
Keywords:
Coercivity
soft imperfection
one-dimentional micromagnetics
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2.2
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