Abstract
We report on measurements of magnetic hysteresis loops and initial permeability of amorphous metals with composition Fe 81.5B 14.5Si 4, Fe 40Ni 40B 20, Fe 39Ni 39(SiB) 20 and Co 67Fe 4Mo 2(SiB) 27 in the temperature range between 4.2 and 300 K. For one sample (Fe 40Ni 40B 20) the coercive force and the permeability are only weakly temperature dependent. The other samples show an increase in the coercive force up to a factor 3 and a decrease of the permeability up to a factor 10 in the temperature range below 70 K. The results are discussed within the framework of the statistical potential theory for Bloch wall movements.
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