Abstract
The magnetic viscosity coefficient S, susceptibility and recoil curves were measured by SQUID for nanocrystalline ${\mathrm{Sm}}_{2}{\mathrm{Fe}}_{15}{\mathrm{Si}}_{2}\mathrm{C}$ ribbons at temperatures ranging from 50 K to room temperature. It was found that the effect of strong intergrain exchange coupling on S and thermal activation volume in nanocrystalline ${\mathrm{Sm}}_{2}{\mathrm{Fe}}_{15}{\mathrm{Si}}_{2}\mathrm{C}$ can no longer be neglected, especially at high temperature. The relation between thermal fluctuation field ${H}_{f}$ and coercivity was analyzed according to two phenomenological models. The mechanism of coercivity was mainly controlled by inhomogeneous pinning rather than a pure nucleation of reverse domain.
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