Abstract
By appropriate annealing of rapidly quenched NdδFe13.1B (2.05<δ<147.6) the amount and microstructure of the Nd2Fe14B grains in the Nd-rich matrix were systematically controlled and correlated with coercivity, μ0Hc. For optimally annealed NdδFe13.1B an increase in Nd concentration enhances μ0Hc of the Nd2Fe14B grains (from 1.2 T in Nd2.05Fe13.1B to 2.75 T in Nd147.6Fe13.1B at 290 K) and promotes the growth of the Nd2Fe14B grains elongated in shape. The largest observed coercivity, Hc ∼ 2.75 T is over 80% of the theoretical limit expected for Stoner-Wohlfarth coherent rotation behavior including demagnetization effects.
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