MAGNETIC-PROPERTIES OF CU-ZN FERRITE INVESTIGATED BY MOSSBAUER-SPECTROSCOPY

The magnetic properties of the ZnxCu1-xFe2O4 ferrite system (x = 0 to 1) have been investigated by means of Mössbauer Spectroscopy. Mössbauer spectra of the CuZn ferrite system, taken at room temperature for x = 0.0 to 0.4 suggest the existence of two hyperfine fields, one due to the Fe3+ tetrahedral ions (A-sites) and the other due to the Fe3+ octahedral ions (B-sites), while for x = 0.5 it shows relaxation behaviour and for x ≥ 0.6 it exhibits a paramagnetic quadrupole doublet. The systematic dependence of the isomer shifts, quadrupole interactions and nuclear magnetic fields of 57Fe3+ ions in both tetrahedral and octahedral sites has been determined as a function of zinc content. The variation of nuclear magnetic fields at the A and B sites are explained on the basis of A-B and B-B supertransferred hyperfine interactions. Analysis of the relaxation spectrum observed at x = 0.5 (300 K) suggests that the relaxation mechanism is due to domain wall oscillations. © 1979.