Abstract
The magnetization reversal behavior for rapidly solidified Zr-doped α-Fe/Nd2Fe14B alloys with high coercivity has been investigated by analyzing hysteresis curves and recoil loops of demagnetization curves. A drastic increase in the coercivity Hc from 620 to 855 kA/m at room temperature by an addition of 1 at. % Zr in α-Fe/Nd2Fe14B alloys has been observed. The maximum value of the integrated recoil loop area for Zr-doped samples of 3.05 kJ/m3 is much lower than that of the Zr-free sample. This result can be explained by a larger recoverable portion of the magnetization remaining in the Zr-free sample as long as the applied reversal field is below the coercivity Hc, i.e., it is an effect of an increased exchange-coupling in the Zr-free sample. The coercivity mechanism of the α-Fe/Nd2Fe14B nanocomposite magnets was analyzed in terms of the Kondorsky model and the plot of Hc(T)/Ms(T) versus HNmin(T)/Ms(T) (Kronmüller plot), respectively.
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