Abstract
We propose a mechanism that exhibits the coercivity reduction of Nd-Fe-B magnets. The model employed here is a micromagnetic model involving the anisotropy- and exchange-fields obtained by using first-principles calculations. The uniqueness of this model is that it has a c-plane magnetic anisotropy around its surface, in contrast to the bulk c-axis anisotropy. We find that the local c-plane anisotropy drastically affects the coercivity, resulting in a reduction by half of the bulk anisotropy field Hk . We also find that partial substitution of Dy for Nd around the surface actually recovers the coercivity.
Original language | English |
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Article number | 113002 |
Journal | Applied Physics Express |
Volume | 4 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2011 Nov 1 |
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)