31%Co-Ni合金に於ける誘起単軸磁気異方性の磁気焼鈍温度および時間に対する依存性

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  • Dependence of the Induced Uniaxial Magnetic Ansiotropy on the Temperature and Duration of Magnetic Anneal in 31%Co-Ni Alloy
  • 31 Co-Ni ゴウキン ニ オケル ユウキタンジク ジキ イホウセイ ノ ジキ ショウドン オンド オヨビ ジカン ニ タイスル イソンセイ

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The dependence of the induced magnetic anisotropy on the temperature and duration of magnetic anneal was studied with 30.84%Co-Ni alloy polycrystal. The magnetic anisotropy was measured by a torque magnetometer specially designed for high-temperature measurements, and the magnetic anneal of the disc specimen was effected as it was mounted on the torque magnetometer. The results and conclusioins obtained are as follows: — The mangetic anisotropy induced by magnetic anneal is uniaxial, its directon of easy magnetization being the direction of the annealing magnetic field. Generally,as the duration of magnetic anneal is prolonged, the induced magnetic anisotropy energy increases quickly at first and then more and more slowly, finally attaining to saturation, and, as the temperature of magnetic anneal becomes higher, the rate of development of the induced anisotropy increses but its saturation value decreases. The development of the induced anisotropy can not be described in terms of single relaxation time and the associated relaxation time becomes longer as the duration of magnetic anneal is prolonged. The dependence of the induced anisotropy, Eu, on the temperature, Θ, of magnetic anneal can well be expressed by the expression Eu=const.×(IΘ⁄Io)2⁄Θ, where IΘ and Io are the values of the saturation magnetization at Θ(°K) and 0°K, respectively, as derived by Taniguchi and Yamamoto from the directional-order theory.

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  • 日本金属学会誌

    日本金属学会誌 25 (6), 415-419, 1961

    公益社団法人 日本金属学会

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