Field-Cooled and Zero-Field-Cooled Magnetization of Superparamagnetic Fine Particles in Cu_97Co_3 Alloy : Comparison with Spin-Glass Au_96Fe_4 Alloy
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概要
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The field-cooled (FCM) and zero-field-cooled (ZFCM) magnetization of ferromagnetic fine cobalt particles in a Cu_<97>Co_3 alloy has been studied. The spin-glass-like temperature dependence of the magnetization has been observed ; ZFCM exhibits a spin-glass-like maximum (at T_p) and FCM is larger than ZFCM at low temperatures. However, the difference between FCM and ZFCM obviously exists far above T_p. Furthermore, FCM increases monotonically with decreasing temperature even below T_p while that of typical spin glasses is nearly independent of temperature. The analysis of the magnetization shows that the temperature dependence of FCM and ZFCM of Cu_<97>Co_3 is well described on the basis of the superparamagnetic blocking model with no interaction between the particles, whereas that of a typical spin-glass Au_<96>Fe_4 cannot be explained by the blocking model.
- 社団法人日本物理学会の論文
- 1995-04-15
著者
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BITOH Teruo
Department of Machine Intelligence and Systems Engineering, Faculty of Systems Science of Technology
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Shirane Takashi
Department Of Applied Materials Science Muroran Institute Of Technology
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CHIKAZAWA Susumu
Department of Applied Materials Science, Muroran Institute of Technology
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Chikazawa Susumu
Department Of Applied Material Science Muroran Institute Of Technology
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Bitoh T
Muroran Inst. Technol. Hokkaido
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Ohba Kazuyuki
Department of Materials Science and Engineering, Muroran Institute of Technology
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Takamatsu Masaki
Department of Materials Science and Engineering, Muroran Institute of Technology
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Chikazawa S
Muroran Inst. Technol. Muroran Jpn
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Ohba Kazuyuki
Department Of Materials Science And Engineering Muroran Institute Of Technology
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Takamatsu Masaki
Department Of Materials Science And Engineering Muroran Institute Of Technology
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