Magnetic, 57Fe Moessbauer 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, Moessbauer and X-ray study. The Moessbauer study shows that easy magnetization direction of the compounds may deviate slightly from the major axis of symmetry; and the average isomer shift of the compounds decreases 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 X-ray measurement that the spontaneous magnetostriction λ111 decreased due to Mn substitution, which can be understood on the basis of the single-ion model. The increase of the polycrystal magnetostriction λs due to Mn substitution was also found and can be ascribed to the increase of λ100, which was suggested to be caused by the change in the filling of d-bands due to substitution. ((orig.))