Theory of the Relaxation of the Uniaxial Anisotropy Induced by Ionic Migration in Iron-Cobalt Ferrites
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概要
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The relaxation character of the induced uniaxial anisotropy in Co_xFe_<3-x>O_4 has been analyzed theoretically, employing several models and taking into account the presence of short range ordering and the detailed micro processes of vacancy migration mechanism. It is shown on mathematical grounds that the relaxation times of the processes are inversely proportional to the density of the cation vacancies, ρ_1, in the crystal. The accurate solution of the relaxation time can be derived specifically for the range of x= 10^<-(1.5〜2). It is 1/τ=4.65・ρ・ f^^- exp ( - Q^^-/(kT)) . The experimental results by Inoue are well described by this equation after putting f^^-=7.5 x 10^<12>sec^<-1>, and Q^^-= 1.0eV at x=0.063. A theory is presented which takes into account the symmetry of the crystal lattice rigorously. The theory is in excellent agreement with the single crystal results by Palmer. It is pointed out that the cobalt ion neighboring a vacancy is in a trivalent state, and that electron transfer is important in lowering the activation energy of the ionic migration.
- 社団法人日本物理学会の論文
- 1966-12-05
著者
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Miwa Hirosi
Department Of Physics Faculty Of Science Osaka University
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Miwa Hirosi
Department Of Physics Faculty Of Science University Of Tokyo
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Iida Shuichi
Department Of Physics Faculty Of Science The University Of Tokyo
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IIDA S.
Department of Pathology, College of Medicine, University of Florida
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Iida Shuichi
Department Of Physics Faculity Of Science University Of Tokyo
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Miwa Hirosi
Department of Agricultural Chemistry, Faculty of Agriculture, Tokyo University of Agriculture
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