6.4%Si-Feおよび50.13%Co-Ni合金単結晶の高温における磁歪および磁化ならびにそれらの遅滞現象

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タイトル別名
  • The Magnetostriction and Magnetization and Their Relaxation at High Temperatures in Single Crystals of 6.4%Si-Fe and 50.13%Co-Ni Alloys
  • 6.4 Si-Fe オヨビ 50.13 Co-Ni ゴウキンタンケッショウ ノ コウオン ニ オケル ジワイ オヨビ ジカ ナラビニ ソレラ ノ チタイ ゲンショウ

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The magnetostriction and magnetization single crystals of 6.4%Si-Fe and 50.13%Co-Ni alloys having [100], [110] and [111] directions have been measured at high temperatures after being thermally demagnetized. And also the time changes of magnetostriction and magnetization during the application of the external field of 285 Oe have been continuously traced from the moment of the application of the field at various temperatures. The periodic changes in the magnetostriction constants of 6.4%Si-Fe single crystals of [100], [110] and [111] directions is abnormal, but those of 50.13%Co-Ni single crystals are normal and almost the same as of Ni. The amount of the time change of magnetostriction during isothermal magnetic annealing in a crystal with the direction of easy magnetization is very large, but that in each crystal with the direction of hard magnetization is small or not observed. A remarkable preliminary relaxation phenomenon appears between 250° and 350°C and a secondary one at the temperature higher than 500°C in [100] and [110] single crystals of 6.4%Si-Fe alloy. The secondary relaxation phenomenon does not appear in 50.13%Co-Ni single crystals. The reason for this fact may be attributed to the difference in crystal structures and the amounts of magnetostriction of the two alloys.<BR>The time, temperature and stress dependences of these two relaxation phenomena are very similar to the micro-creep under a constant small stress. From these results it is concluded that there are two different magnetic annealing effects in ferromagnetic materials or the Si-Fe alloy. The preliminary phenomenon may be called the low temperature effect and the secondary one the high temperature effect, but in case of the Co-Ni alloy, these two effects can not be clearly destinguished as both effects begin to occur at 300°C. These two effects may be considered due to the magnetostriction at high temperatures.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 28 (4), 200-207, 1964

    公益社団法人 日本金属学会

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