Abstract
The long-term aging effect on the coercive force was studied for Co-based and Fe-based amorphous cores. Both amorphous cores show the same tendency in the aging process of their coercivities; they increase linearly with the logarithm of aging time over one year. The nonsaturated aging kinetics of the coercive force were analyzed by a method based on the pair ordering model reported by Taniguchi. The method does not need the saturation value of the coercive force and enables us to estimate the deterioration of the cores at operating temperatures which are lower than the aging temperatures. The increase in the coercivity for our cores was estimated to be less than 15 mOe after 106 h at 100°C.
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