Magnetic Property of Antiferromagnetic MnO Ultrafine-Particle.

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  • Sako Sanshiro
    Department of Physics, Faculty of Education, Mie University, Tsu, Mie 514
  • Umemura Yoshifumi
    Department of Physics, Faculty of Education, Mie University, Tsu, Mie 514
  • Ohshima Kazunari
    Laboratory of Physics, Matsumoto Dental College, Shiojiri 399–07
  • Sakai Masahiro
    Instrument Center, Institute for Molecular Science, Myodaiji, Okazaki 444
  • Bandow Shunji
    Instrument Center, Institute for Molecular Science, Myodaiji, Okazaki 444

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タイトル別名
  • Magnetic Property of Antiferromagnetic

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説明

Superparamagnetism was observed in antiferromagnetic MnO ultrafine-particles with the size range of 3.7-- 5.4, nm. The decrease of Néel temperature in these finite systems was confirmed by measuring the temperature dependence of the magnetic susceptibility. The size dependence of a magnetic moment per atom and per particle was estimated by fitting the magnetic susceptibility to the Curie-Weiss law at higher and lower temperature than the Néel temperature, respectively. The former increased with decreasing size due to the surface effect, and the latter increased in proportion to the square root of the number of spins in a particle as expected in antiferromagnetic particles. The size dependence of the coercive force and the blocking temperature was remarkable in this narrow size range due to the magnetic interaction between particles.

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