Temperature effect on domain-wall damping in an amorphous alloy

The temperature dependence of the viscous damping parameter $\beta$, restoring constant $\alpha$, and propagation field $H_p$ have been measured in ferromagnetic amorphous ribbons. We have observed that there is a linear dependence of $\beta$ on $\frac{{\left({\mu }_0{M}_s\right)}^2}{\rho }$ up to $T=0.9\mathrm{}{T}_c$ and that $\alpha$ is proportional to ${\left({\mu }_0{M}_s\right)}^2$. From these data, it is possible to estimate the eddy-current (${\beta }_E$) and relaxation (${\beta }_R$) contributions to $\beta$ separately. It is further inferred that the number of domain walls and the magnetic pole distribution in the sample do not change up to $T\simeq 0.9T_c$.