No abstract

AC susceptibility, zero-field-cooled (ZFC) magnetization and field-cooled (FC) magnetization have been reported for the Zn0.5Co0.5Fe1.1Cr0.9O4 disordered ferrite system. A polarization analysis of the transmitted neutron beam in both ZFC and FC conditions has also been reported for Zn0.5Co0.5Fe2-xCrxO4(x=0.9 and 1.0) systems. The low-field AC susceptibility shows a broad peak at a temperature (well below the Neel temperature) where a strong irreversibility between the ZFC and FC curves starts. The presence of a ferrimagnetic-like domain structure over the entire temperature range (below the Neel temperature) is confirmed from the presence of significant depolarization up to 12 K, the lowest measured temperature. The observed features of chi AC, magnetization and neutron depolarization measurements have been analysed using a model of thermally activated domain wall movement of ferrimagnetic arrangement of local canted spins.

No abstract

Zero-field-cooled magnetization, field-cooled magnetization and hysteresis measurements on Zn,Col-,FeCrO4 (x = 0.45 and 0.50) ferrite samples are reponed using a SQUID magnetometer. The data have been analysed using a model of ferrimagnetic arrangement of local canted spins, in the light of our earlier neutron diffraction data reported on these systems.