Ferromagnetic Resonance in Single Crystals of Cobalt-Substituted Nickel Ferrite

概要

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The ferromagnetic resanance linewidth ΔH, the magnetic anisotropy constants K_1, K_2 and the g-factor are observed at 9.27 GC and in the temperature range from 80°K to 300°K for small spherical single crystal specimens of the composition Co_xNi_<1-x>Fe_2O_4, where, x=0, 0.006, 0.03, 0.06, 0.12. The K_1, (-K_2) and ΔH increase linearly with the increase of the cobalt concentration at a fixed temperature. The ferromagnetic g-factor increases with cobalt content. The contribution of cobalt ion to the anisotropy is found to have nearly the same temperature dependence as that of cobalt ferrite, and the Increase of K_1 caused by cobalt ions is well described by Tachiki's theory after putting lαλ|=97 cm^<-1> and γ=0.7. The linewidth at room temperature increases by about 8 Oe for one percent of cobalt ions. The linewidth becomes anisotropic at low temperatures. It is concluded that the contribution of cobalt ions is most pronounced in Fe_3O_4, next in MnFe_2O_4, and smallest in NiFe_2O4, in agreement with the degree of uniformity of the electric charge distribution on 16d sites.
社団法人日本物理学会の論文
1965-05-05