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A study of magnetostriction, spin reorientation, and Mssbauer spectra of Tb_(0.3)Dy_(0.6)Pr_(0.1)(Fe_(1-x)Al_x)1.95 alloys with substitution of Fe by Al

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science china(Physics,Mechanics & Astronomy) 2010年第3期53卷 449-453页

作者： zheng xiaoping1,3, zhang peifeng1,2, li fashen2 & hao yuan2 1 institute of electronic information science and technology, lanzhou city university, lanzhou 730070, china 2 Key Laboratory for Magnetism and Magnetic Materials, Ministry of Education, lanzhou university, lanzhou 730000, china 3 State Key Laboratory of Advanced Non-Ferrous Materials, Gansu Province, lanzhou university of technology, lanzhou 730050, china 1. institute of electronic information science and technology Lanzhou City University Lanzhou 730070 China3. State Key Laboratory of Advanced Non-Ferrous Materials Gansu Province Lanzhou University of Technology Lanzhou 730050 China2. Key Laboratory for Magnetism and Magnetic Materials Ministry of Education Lanzhou University Lanzhou 730000 China

The effects of Al substitution for Fe on the structure, magnetics, magnetostriction, anisotropy and spin reorientation of a series of Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95 alloys (x=0.05, 0.1, 0.15, 0.2, 0.25, 0.3) at room temperature have been investigated. The alloys of Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95 substantially retain MgCu2-type C-15 cubic Laves phase structure when x2. The mixed phases appear with x = 0.2, and cubic Laves phase decreases with increasing x. The magnetostriction of the Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95 alloys decreases drastically with increasing x and the giant magnetostrictive effect disappears for x > 0.15. Fortunately, a small amount of Al substitution is beneficial to a decrease in the magnetocrystalline anisotropy. The spin reorientation temperature decreases with increasing x. The analysis of the Mssbauer spectra indicates that the easy magnetization direction in the {110} plane deviates slightly from the main axis of symmetry with the increase of Al concentration x, namely, spin reorientation, resulting in the change of macroscopical magnetic properties and magnetostriction. The hyperfine field decreases, but the isomer shifts increases with Al concentration increasing and the quadruple splitting QS shows a weak concentration dependence.

关键词： cubic laves phase magnetostriction spin reorientation Mssbauer

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Structure, spin reorientation and Mssbauer effect studies of Tb0.3Dy0.7(Fe1-xAlx)1.95 alloys

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science china(Physics,Mechanics & Astronomy) 2006年第2期Mechanics & Astronomy) .卷 149-157页

作者： zheng xiaoping1,2,4, zhang peifeng1,3, FAN Duowang1, li fashen3 & hao yuan41. Key Laboratory of Opto-electronic technology and Intelligent Control, Ministry of Education, lanzhou Jiaotong university, lanzhou 730070, china 2. institute of electronic information science and technology,lanzhou Teachers College, lanzhou 730070, china 3. Key laboratory for Magnetism and Magnetic Materials, Ministry of Education, lanzhou university, Lan-zhou 730000, china 4. State Key Lab. of Advanced Non-Ferrous Materials, Gansu Province, lanzhou university of technology, lanzhou 730050, china

The effect of Al substitution for Fe on crystal structure, magnetostriction and spontaneous magnetostriction, anisotropy and spin reorientation of a series of polycrys-talline Tb0.3Dy0.7(Fe1?xAlx)1.95 alloys (x = 0, 0.05, 0.1, 0.15, 0.20, 0.25, 0.30, 0.35) at room temperature and 77 K was investigated systematically. It was found that the primary phase of Tb0.3Dy0.7(Fe1?xAlx)1.95 is the MgCu2-type cubic Laves phase structure when x 3Dy0.7(Fe1?xAlx)1.95 increases approximately and monotonically with the increase of x. The substitution of Al leads to the fact that the magnetostriction λ inceases slightly in a low magnetic field (H ≤ 40 kA/m), but decreases sharply and is easily close to saturation in a high applied field as x increases, showing that a small amount of Al substitution is beneficial to a decrease in the magnetocrystalline anisotropy. It was also found that the spontaneous magnetostriction λ111 decreases greatly with x in-creasing. The analysis of the M?ssbauer spectra indicated that the easy magnetization direction in the {110} plane deviates slightly from the main axis of symmetry with the changes of composition and temperature, namely spin reorientation. A small amount of non-magnetic phase exists for x = 0.15 in Tb0.3Dy0.7(Fe1?xAlx)1.95 alloys and the alloys be-come paramagnetic for x > 0.15 at room temperture, but at 77 K the alloys still remain magnetic phase even for x = 0.2. At room temperature and 77 K, the hyperfine field de-creases and the isomer shifts increase with Al concentration increasing.

关键词： magnetostriction cubic Laves phase spin reorientation M?ssbauer.

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