A MIXED NICKEL-CADMIUM FERRITE INVESTIGATED BY MOSSBAUER SPECTROMETRY

Out-field and in-field Mossbauer experiments were performed at low tem perature on several mixed nickel-cadmium ferrites. We report on a firs t analysis of the in-field Mossbauer spectra, which involve two indepe ndent discrete distributions of effective fields: the relative area of octahedral and tetrahedral ferric contributions suggests the existenc e of reversed magnetic moments located in octahedral sites. In additio n, the line intensities of the in-field spectra give clear evidence fo r a collinear ferrimagnetic structure up to x = 0.30 and a canted spin structure for x > 0.30.