面心立方Ni-Co合金における誘起単軸磁気異方性の測定温度及び合金組成に対する依存性

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  • Dependence of the Induced Uniaxial Magnetic Anisotropy on the Measuring Tamperature and on the Alloy Composition in Face-Centered Nickel-Cobalt Alloys
  • メン シンリッポウ Ni-Co ゴウキン ニ オケル ユウキタンジク ジキ イホウセイ ノ ソクテイ オンド オヨビ ゴウキン ソセイ ニ タイスル イソンセイ

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The dependence of the induced uniaxial magnetic anisotropy energy, Eu, on the measuring temperature, T, was studied, using the method of torque magnetometer, with a (1\={1}0) disc single crystal of 12%Co-Ni alloy annealed in sufficiently strong magetic field, and the observed dependence was found to be well expressed by the relation Eu=const.×(IT⁄IO)2, where IT and IO are, respectively, the values of saturation magnetization at T (°K) and at 0°K, as derived by Taniguchi and Yamamoto from the stand point of directional order theory. In connection with this study, the temperature dependence of the cubic magnetocrystalline anisotropy constants, K1 and K2, was measured with 12%Co-Ni alloy and pure nickel, and it has been found that, as the temperature rises, K1 of 12%Co-Ni alloy changes from positive to negative at about 150°C, while K1 of nickel shows small positive values above 200°C, and that K2 of 12%Co-Ni alloy is always positive, while K2 of nickel changes from positive to negative at about 100°C. The alloy composition dependence of Eu was studied with magnetically annealed polycrystalline discs of 10.57, 20.78, 30.84, 40.67, 50.17, and 60.20%Co-Ni alloys, and it has been found that Eu shows a peak value of 8.4×102 erg/cm2 at about 50%Co. The comparison of the measured data as corrected for the composition dependence of the Curie temperature with Néel’s theoretical formula indicates that the ordering energy of Ni-Co alloys is negative and, hence, the alloys are of the precipitation type.

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  • 日本金属学会誌

    日本金属学会誌 25 (6), 419-424, 1961

    公益社団法人 日本金属学会

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