Abstract
The effect of the strength of exchange interaction on the nucleation field $H_{N}$ was studied by computer simulation with varying temperature as well as the size of the non-magnetic phase for Nd(Fe,Co)B magnets composed of fine grains. It was clarified that the spatial distribution of demagnetizing field $H_{d}$ is widened by an increase in the size of the non-magnetic phase and that the ratio of the spatial size of $H_{d}$ to the exchange length $L_{\mathrm {ex}}$ is an important factor of determining $H_{N}$ . Resultantly, the increase in the exchange strength increased $H_{N}$ . Based on this calculation result, magnetic properties of Nd(Fe,Co)B magnets were simulated and it was found that a small amount of substitution of Co for Fe increases $L_{\mathrm {ex}}$ and resultantly improves $H_{N}$ at high temperatures.
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