Abstract
In the present study magnetic and magnetostrictive properties of Tb(Fe1−xTx)2 (T=Mn, Ga) compounds were examined by magnetic measurement, Mössbauer, and x-ray study. Mössbauer 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 decreases with increasing the x value, which was attributed to the charge transfer from 3d electrons of Mn atoms or 4p electrons of Ga atoms into the 3d band of Fe. It was also found from x-ray measurement that the spontaneous magnetostriction λ111 decreased due to Mn or Ga 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 may be caused by the filling of d bands due to substitution.
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