On the Effect of Isothermal Magnetic Annealing on the Magnetization and Magnetostriction in a Fe_3Cr Superlattice Alloy at High and Room Temperaturer
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概要
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The magnetization and magnetostriction at high temperatures in a Fe_3Cr alloy thermally demagnetized were measured simultaneously and their time variations at constant temperatures in external fields of 71.3 Oe and 285 Oe have been continuously traced from the instant of application of the field. Then, the magnetization and magnetostriction at room temperature were measured after the isothermal magnetic annealing which was continued till the time variations were completed. The amount of the time variation of magnetization and magnetostriction at high temperatures becomes larger as the duration of the application of the field is prolonged and the strength of applied field is raised. The effect of isothermal magnetic annealing begins to appear at about 400°C and increases with raising temperature, till the effect reaches its maximum at about 530℃. Then, it decreases rapidly and becomes very small in the temperature range higher than the transformation temperature of Fe_3Cr superlattice. With the progression of annealing, the positive magnetostriction becomes smaller and even changes to a negative one in the case of magnetic annealing for 150 hr in the external field of 285 Oe in the temperature range from 500 to 540℃, showing that there is an anisotropy of magnetostriction in Fe_3Cr alloy. The effect of the isothermal magnetic annealing on the magnetization and magnetostriction at room temperature in Fe_3Cr alloy are almost similar to that at high temperatures, excepting that the maximum permeability at room temperature is larger when the alloy was annealed in the external field of 71.3 Oe, than in the case of the annealing in the field of 285 Oe. According to these results, it can be concluded that the relaxation of the magnetization and magnetostriction is caused by a microcreep or a phenomenon similar to it, due to magnetostriction at high temperatures, and that the superlattice transformation plays an important role in the progress of the effect.
- 東北大学の論文
著者
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SAITO Hideo
The Research Institute for Iron, Steel and Other Metals
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Masumoto Hakaru
The Research Institute Of Electric And Magnetic Alloys
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Masumoto Hakaru
The Research Institute For Iron Steel And Other Metals
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Saito Hideo
The Research Institute For Iron Steel And Other Metals
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Takahashi Minoru
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Saito Hideo
The Resarch Institute For Iron Steel And Other Metals
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Takahashi Minoru
Department Of Appied Physics Tohoku University
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