強磁性材料の単磁区微粒子の検証とその臨界寸法に関する実験的研究
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概要
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Small particles of ferromagnetic BaO⋅Fe<SUB>2</SUB>O<SUB>3</SUB>, SmCo<SUB>5</SUB>, SM<SUB>2</SUB>Co<SUB>17</SUB> and Nd<SUB>2</SUB>Fe<SUB>14</SUB>B compounds were prepared by the circumspect powder metallurgical method, and behaviours of their magnetic domains were studied with the decrease of the particle size.The colloid-SEM method invented by the present author was effectively used to observe domains of small particles less than 10 μm in size. With the decrease of the particle size the number of domains in one particle decreases, and finally the single-domain state is found for each compound, as expected by the theories. The critical size for single-domain particles, which is defined by the upper limit of the particle size range where the single-domain state can exist, is successfully estimated for all the above compounds from the particle size distribution curve of many single-domain particles, and obtained values of the critical sizes of the compounds are compared with the theoretical ones.
- 社団法人 粉体粉末冶金協会の論文