Magnetization reversal in co-precipitated cobalt ferrite

Abstract

A study about the magnetic viscosity and magnetization reversal in co-precipitated cobalt ferrite was carried out. Measurements of direct current demagnetization reversible M rev and irreversible M irr magnetization as well as magnetic viscosity S η were performed at room temperature along the demagnetization curve for different applied fields H ap (0>H ap >−7 kOe) . From these data M rev( M irr) H i curves were built. The experimental results show a minimum in the M rev( M irr) H i curves and a non-proportionality between S η and χ irr, suggesting two different contributions to the reversal magnetization during the demagnetization process.