Structural, magnetic and magnetostrictive studies of Tb0.27Dy0.73(Fe1 − xAlx)2 |
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Authors: | Hui-qun Guo Hong-ying Yang Bao-gen Shen Lin-yuan Yang Ru-qi Li |
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Affiliation: | State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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Abstract: | Measurements of magnetic properties, X-ray diffraction and magnetostriction were made on Tb0.27Dy0.73(Fe1 − xAlx)2 (x = 0.1, 0.2, …, 0.7) compounds. It was found that the system has the cubic MgCu2 structure over almost the whole (Fe,Al) concentration range investigated, except for a narrow intermediate range (x = 0.4–0.6) where the hexagonal MgZn2 structure appears. With increasing Al content x, the lattice constant a increases linearly with x. The first replacement of Fe results in a marked decrease in the Curie temperature, which is followed by a slight decrease in TC with x. A linear decrease in magnetostriction of |λ| − λ| at room temperature with x was also observed from 1530 × 10−6 for x=0 to 36×10−6 for x=0.3. The saturation magnetization σs exhibits a complex concentration dependence in the Tb0.27Dy0.73(Fe)1 − xAlx)2 system: in the range x < 0.5, σs increases linearly with x and, for x = 0.5–0.6, σs decreases and then increases again. An enhancement of the magnetic ‘hardness’ in this system was also observed at low temperature. |
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