MAGNETIC PROPERTY OFCoOULTRAFINE PARTICLE

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

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 109-113

Abstract: The effect of the decrease in the coordination number of atoms in surface on the magnetic transition temperature was investigated experimentally and theoretically forCoOultrafine particles. The decreasing tendency of the Néel temperatureTNwith decreasing average size was confirmed in the size range from 2.0 to 3.0 nm through the ESR measurement. The similar tendency ofTNfor size was gained through the calculation ofTNin the mean-field theory using the prism model within the Ising thin-film model.

Date: 1996
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DOI: 10.1142/S0218625X96000231

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