Ferromagnetic Crystalline Anisotropy of MeFe_2O_4-Fe_3O_4 Ferrite Solid Solutions

概要

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The ferrite crystals of ternary system (Mn_xFe_yNi_x)Fe_2O_4, where x+y+z=1, were grown by the Bridgman method in the air. According to the X-ray analysis, they have the spinel structure, except in the region near NiFe_2O_4, and their lattice constants depend linearly on the concentration: a=(8.518-0.125y-0.176z)±0.005 A. The ferromagnetic crystalline anisotropy was measured by the torque method in the temperature range between 90°K and 300°K. In normal specimens K_1 decreases with decreasing temperature. NiFe_2O_4-Fe_3O_4 system shows an anomalous temperature dependence for a wide range of concentration: K_1 increases and changes its sign from negative to positive at low temperature. This will be due to the short range order of Fe^<2+> and Fe^<3+> at the octahedral site of the spinel lattice.
社団法人日本物理学会の論文
1961-07-05