Field-induced uniaxial anisotropy in partially ordered Ni3Mn at low temperatures |
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Authors: | Takehiko Satoh Yuko Yokoyama Isamu Oguro |
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Institution: | Electrotechnical Laboratory Mukodai-machi, Tanashi, Tokyo, Japan;The Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato-ku, Tokyo, Japan |
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Abstract: | A uniaxial anisotropy is induced in partially ordered MnNi alloys in the composition range near Ni3Mn, by applying a magnetic field during cooling from room temperature to 77 K. The uniaxial anisotropy constant Ku depends on both the magnitude of the torque measuring field and that of the cooling field. The easy axis direction tends to be between the 〈100〉 and the direction of the cooling field. The value of Ku shows a maximum when the cooling field is applied along 〈100〉, amounting to 2 × 104 crg/cm3. On the other hand, the crystalline anisotropy is not affected by field cooling. When the temperature is raised from 77 K to 300 K, neither Ku nor the rotational hysterisis loss is observed to have any critical temperature, for a torque measuring field of 20 kOe. As atomic ordering proceeds, these effects become smaller and appear to vanish in the perfectly ordered state. |
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