Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. B 23, 3355 (1981). Copyright © 1981 American Physical Society. Permission to use.


Magnetic viscosity measurements on amorphous Tb75Au25 and (Er65Fe35)90B10 alloys are presented in the temperature range of 1.3 to 30 K. The magnetization in a steady magnetic field is found to follow a logarithmic time dependence for times up to 400 s suggesting a spectrum of activation energies. The magnetic viscosity parameters were used to investigate the temperature dependence of the observed large coercive fields and to study intrinsic temperature and thermal activation effects. It is found that the large change of the coercive field at very low temperatures is mainly due to thermal activation of domains over the energy barriers.

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