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Manipulation of temperature dependence of coercivity in isotropic nanocrystalline permanent magnets

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2 Author(s)
Y. Shigemoto ; Res. & Dev. Div., NEOMAX Co. Ltd., Osaka, Japan ; S. Hirosawa

The manipulation of the temperature dependence of coercivity, HcJ(T), in Nd-Fe-B-Ti-C-M (M = Ca, Sr, Bi and Ga) nanocrystalline permanent magnets by modifying the intergranular exchange coupling coefficients, Jeff, is obtained. Such HcJ manipulation is seen in a micromagnetic model describing the ratio of exchange energy and magnetocrystalline energy for a grain magnetically coupled to surrounding grains. The dependence of the absolute value of the temperature coefficient, alpha;(HcJ), between 296 K and 373 K on cooling rate is observed in annealed ribbons.

Published in:

INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.

Date of Conference:

4-8 April 2005