Magnetization and Nucleation Behavior of Saturable Multi-Domain Particles in Sm2Fe17N3 Magnetic Powders

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  • Kobayashi K.
    Department of Materials Science, Shizuoka Institute of Science and Technology (Laboratoire de Magnétisme Louis Néel, CNRS)

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  • 着磁可能Sm2Fe17N3磁石多磁区粒子における着磁および核生成挙動の解析
  • チャクジ カノウ Sm2Fe17N3 ジシャク タ ジク リュウシ ニ オケル

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Abstract

Sm2Fe17N3 powders used in permanent magnets are composed of three types of particle: (1) single-domain particles (SDPs), (2) multi-domain particles (MDPs) in which the domain walls move under a relation of Happl. = NM, where N is a demagnetizing factor, M is the magnetization in a particle and Happl. is an applied magnetic field, and (3) particles that behave as MDPs in a demagnetized state, but can be magnetized to become SDPs under a certain magnetic field and behave as SDPs unless renucleation occurs. The authors studied the magnetization and nucleation behavior of the last type of particles, which they call saturable multi-domain particles (SMDPs). In this report, the relation between magnetization and nucleation fields in SMDPs is measured for isolated and isotropically distributed Sm2Fe17N3 particles.

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