Synthesis and magnetic properties of Pr(Fe 1-xCo x) 2 and Pr 1-yTb y(Fe 0.4Co 0.6) 2 alloys |
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| Authors: | S.L. Tang H.B. Li P. Zhang D.H. Wang M. Lu Y.W. Du |
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| Affiliation: | (1) National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 210093 Nanjing, China |
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| Abstract: | Measurement of X-ray diffraction, magnetization and magnetostriction was made on the Pr(Fe1-xCox)2 (x=0.4, 0.5 and 0.6) and Pr1-yTby(Fe0.4Co0.6)2 (y=0, 0.1, 0.2 and 0.3) alloy series. It was found that a cubic phase with the MgCu2 structure can be obtained in the Pr(Fe1-xCox)2 series only at x=0.6. The Pr1-yTby(Fe0.4Co0.6)2 system has the cubic MgCu2 structure over the studied range for y. The lattice constant and magnetization decrease and the Curie temperature increases with increasing y. At 7 K, Pr1-yTby(Fe0.4Co0.6)2 samples are found to have huge intrinsic coercivities, which are associated with narrow domain walls. It is also found from X-ray measurement that in Pr1-yTby(Fe0.4Co0.6)2 the spontaneous magnetostriction  111 increases due to Tb substitution, while the saturation magnetostriction s is much lower than 111. This can be attributed to the large value of 100 with an opposite sign to 111, which may be caused by the filling of the d band due to Co substitution. PACS 75.80.-g; 61.10.-i; 75.60.-d |
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