ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Magnetic aftereffect and irreversible flux loss at elevated temperatures were studied for fully dense isotropic and anisotropic Nd-Fe-Co−B magnets consolidated from rapidly quenched powder by direct joule heating. The consolidation process and the subsequent alignment of c axis do not affect the aftereffect constant Sv and the prepared magnets have roughly the same Sv as a bonded magnet, independent of coercivity at room temperature (650–1200 kA/m), exposure temperature (60–120 °C), and anisotropy of the magnets. Thus the magnitude of the aftereffect is determined mainly by the magnitude of the irreversible susceptibility χirr. It was also clarified empirically that the irreversible flux loss FL is proportional in magnitude to χirr. However, the slopes of the FL vs χirr line for isotropic magnets are much larger than those for the anisotropic ones. Thus FL can be reduced by decreasing χirr and/or making magnets anisotropic.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.358116
