MAGNETIC, FE-57 MOSSBAUER AND X-RAY STUDIES OF TB(FE1-XMNX)2 ALLOYS

In the present study, magnetic and magnetostrictive properties of Tb(Fe1-xMnx)(2) compounds were examined by magnetic measurement, Mossbauer and X-ray study. The Mossbauer study shows that the easy magnetization direction of the compounds may deviate slightly from the major axis of symmetry; and the average isomer shift of the compounds increases with increasing x-value, which was attributed to the charge transfer from 3d electrons of Mn atoms into the 3d band of Fe. It was also found from the X-ray measurement that the spontaneous magnetostriction lambda(111) decreased due to Mn substitution, which can be understood on the basis of the single-ion model. The increase of the polycrystal magnetostriction lambda(s) due to Mn substitution was also found and can be ascribed to the increase of lambda(100), which was suggested to be caused by the change in the filling of d-bands due to substitution.