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期刊论文
Magnetic anisotropy properties and spin reorientation for textured Bi-Mn alloys fabricated by a field-inducing technique
PHYSICAL REVIEW B 70, 184424 (2004),-0001,():
By a magnetic-field-inducing technique, Bi-Mn alloys were fabricated with the textured structure and anisotropic characteristics. Magnetic properties of MnBi compound aligned in alloys with 6 wt% Mn have been investigated systematically. The saturation magnetization Ms decreases with the increase of temperature. At temperatures below 150K, the coercive field Hc decreases with the increase of temperature, while the coercive field Hc increases with temperature above 150 K. In the range of temperature from 150 to 300K, the remanent magnetization Mr and the Mr /Ms increase with the temperature, while below 150K, the Mr and the Mr/Ms reach a constant value of nearly zero. The magnetic moments rotated from being parallel to the c axis toward the basal plane for MnBi (the low-temperature phase) at about 90K. Most of all, under a dc magnetic field applied parallel to the c axis, the transition temperature of the spin reorientation decreases with the increase of magnetic field, and even decreases 30K under 5T. The mechanism of the spin-reorientation transition and the change of its transition temperature are discussed and explained by phenomenological theory.
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