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- W3080936183 abstract "We have studied the thermal stability of coercivity in anisotropic Nd-Fe-B magnet from 300 K to 500 K by combining the micromagnetic simulation with the numerical estimation of coercivity reduction caused by thermal activation. The numerically achieved coercivities agree well with the measured value of a conventional sintered magnet. The concave shape of Hc(T) which is different from linear shape of HA(T) in anisotropic Nd-Fe-B magnets, as well as the break of linearity in the fitting of Hc/Ms vs. HA/Ms are found both originated from the temperature dependence of magnetization of the ferromagnetic grain boundary phase. This curving of Hc(T) can be eliminated via transformation of grain boundary magnetism into non-ferromagnetic. We have demonstrated this hypothesis experimentally in the hot-deformed magnet heavily infiltrated with Nd–Cu alloy. The parameters, α and Neff, achieved in the fitting of Kronmüller equation are found to be largely deviated from those achieved in micromagnetic method, which is due to the ignorance of temperature dependent grain boundary magnetization and the thermal activation effect in the fitting." @default.
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- W3080936183 date "2020-10-01" @default.
- W3080936183 modified "2023-10-18" @default.
- W3080936183 title "On the temperature-dependent coercivities of anisotropic Nd-Fe-B magnet" @default.
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- W3080936183 doi "https://doi.org/10.1016/j.actamat.2020.08.040" @default.
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