Coercivity mechanism in Nd/sub 15.1/Fe/sub 76.9/B permanent magnets

The torque curves performed on Nd/sub 15.1/Fe/sub 76.9/B/sub 8/ permanent magnets are analyzed taking into account the influence of the demagnetizing field on both the torque and nucleation field. The anisotropy constant K/sub d/ resulting from the demagnetizing fields is determined. Domain structure photographs on a surface parallel to the easy axis are taken during the magnetic field rotation from 0 degrees to 360 degrees and 360 degrees to 0 degrees . From the results, it follows that the demagnetization process in Nd/sub 15.1/Fe/sub 76.9/B/sub 8/ magnets occurs by the nucleation of reversed domains.<
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