Abstract
MnBi particles were prepared by grinding sintered MnBi in a ball mill. The coercivity of these MnBi particles was measured at 300 K and 85 K. At 300 K, the coercivity increased remarkably by grinding, and showed the highest value of 16000 Oe. At 85 K, the coercivity was very low compared with that at 300 K, and was about 80–400 Oe. For the particles which showed the coercivity of 16000 Oe at 300 K, the temperature dependence of coercivity was measured in the temperature range between 300 K and 85 K. The results were explained by considering the single-domain behavior of these particles.
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