57Fe Mössbauer spectroscopic studies of the magnetic anisotropy and spin reorientations in Nd3(Fe1−Co )27.7Ti1.3 (0⩽x⩽0.4)

Abstract 57 Fe Mossbauer spectra at 85, 200 and 293 K of magnetically aligned powders of Nd 3 (Fe 1− x Co x ) 27.7 Ti 1.3 (0⩽ x ⩽0.4) have been obtained. The fitting procedure has been done taking into account the occupancy of the Fe sites by Co and Ti. From the intensity ratio of the Mossbauer lines it has been concluded that the x =0 compound presents easy-cone-type anisotropy and the x =0.3, 0.4 axial anisotropy over the whole temperature range 85–293 K. For x =0.1, 0.2 a spin reorientation transition has been observed from axial anisotropy at 293 K to an easy-cone-type anisotropy at low temperatures.