Single-domain particles of Nd₂Fe₁₄B observed by the colloid-SEM method

H. Hasegawa Chichibu Research Laboratory, Showa Denko K.K., 1505 Shimokagemori, Chichibu-shi, Saitama, 369-18, Japan

K. Goto Research Institute for Scientific Measurements, Tohoku University, 2-1-1 Katahira, Sendai-shi, 980, Japan

K. Haneda Research Institute for Scientific Measurements, Tohoku University, 2-1-1 Katahira, Sendai-shi, 980, Japan

T. Sakurai Research Institute for Scientific Measurements, Tohoku University, 2-1-1 Katahira, Sendai-shi, 980, Japan

Abstract

Magnetic domains in fine particles of Nd₂Fe₁₄B ball-milled to less than several micrometres in size have been studied by the colloid-scanning electron microscope (SEM) method, which is a method for observation of small domains. The single-domain state has been clearly found on the c plane in several particles. Their domain patterns are shown for two single-domain particles of 1·0 and 1·2 μm size. These particle sizes are compared with a simple theoretical estimate.

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Single-domain particles of Nd₂Fe₁₄B observed by the colloid-SEM method

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Single-domain particles of Nd₂Fe₁₄B observed by the colloid-SEM method