Ni-25%Co合金単結晶の高温の磁気歪みおよび磁化におよぼす磁界中加熱効果

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  • Effect of Magnetic Annealing on the Magnetostriction and Magnetization of Single Crystals of Ni-25%Co Alloy at High Temperatures
  • Ni 25パーセント Co ゴウキン タンケッショウ ノ コウオン ノ ジキ

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The time-variations of magnetostriction and magnetization of rod shaped single crystals of Ni-25%Co alloy were observed in an external magnetic field of 6.4 kA/m at high temperatures. The magnetostriction and magnetization at room temperature were also measured in an external field of 82 kA/m when the specimens were slowly cooled in the furnace without magnetic field after their time variations had been terminated.<BR>The absolute value of magnetostriction decreased with time taking a relaxation phenomenon in a temperature range from 350 to 500°C. At the same time, the magnetization increased with decreasing magnetostriction and finally both values became gradually constant. These variations in the direction of easy magnetization at high temperatures were very remarkable and most of the values were retained down to room temperature. In the direction of hard magnetization, however, their variations were small and the values at room temperature after magnetic annealing returned to those prior to magnetic annealing. However, the activation energy calculated from the relaxation curves of magnetostriction and magnetization in both directions showed a value of about 2.7 eV. In this case the activation energy was a similar kind of energy required for the atom diffusion in a solid.<BR>It seems most probable that the magnetic annealing effect arises from the rearrangement and fixing of domains due to the relaxation of internal stress caused by magnetostriction at high temperatures. In this process, it is supposed that the constituent atoms of the crystals and impurities, and structural defets such as dislocations, vacancies, etc. are moving and diffusing.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 44 (1), 107-111, 1980

    公益社団法人 日本金属学会

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