Abstract
The magnetization processes in nanocomposite PrCo4.5C0.5 ribbons that are composed of two hard magnetic phases PrCo5Cδ and Pr5Co19Cε have been systematically investigated. The magnetic reversal of the samples is found to be mainly determined by inhomogeneous domain wall pinning. Different from the nanocomposite magnets with hard and soft magnetic phases, the reverse field, where the reversible susceptibility χrev peaks, is found to be 5.8kOe, which is much lower than the field corresponding to the χtotal maximum. The study of magnetic viscosity indicates that the time dependence of magnetization is primarily determined by the reversal of PrCo5Cδ phases, and a larger activation volume, v=3.2×10−18cm3, is deduced for the PrCo4.5C0.5 ribbons.
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