Linear and Nonlinear Susceptibilities of Ferromagnetic Fine Particles in Cu_<97>Co_3 Alloy

概要

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The ac linear (χ_0) and nonlinear (χ_2) susceptibilities of ferromagnetic fine cobalt particles , which were precipitated in a Cu_<97>Co_3 alloy, have been studied. Theχ_0 has a spin-glass-like maximum andχ_2 has a very broad negative peak at a low temperature. At high temperatures, the in-phase linear susceptibilityχ^'_0 obeys the Curie law and the in-phase nonlinear susceptibilityχ^'_2 is proportional to T^<-3>. A quantitative analysis ofχ_0 and X_2 based on a simplified superparamagnetic blocking model has been performed. The temperature dependence of the in-phase and out-of-phase susceptibilities is well described quantitatively by the superparamagnetic blocking model. It is concluded the behavior ofχ_2 can be explained by the summation of the nonlinear term of the Langevin function over particle volume distribution. The analysis also yields information about the particle volume distribution and a value of anisotropy energy.
社団法人日本物理学会の論文
1995-04-15