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Abstract
The nucleation mechanism to predict coercivity values in melt-spun exchange-coupled (Nd 1− x Pr x ) y Fe 94− y B 6 alloys for various Nd:Pr ratios x, and Fe:RE ratios y, was tested using the dependence of the anisotropy constant K 1 on Pr content x for the minimum nucleation field H N min in the modified Brown's equation. Very good agreement was found between experimental data and theoretical values, confirming the predominance of the nucleation of reverse domains over the wall pinning process in the coercivity mechanism of melt spun REFeB alloys.
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