高Bs非晶質合金の磁気特性について

概要

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In order to obtain a high Bs soft amorphous ferromagnet useful for transformer materials and other devices, the magnetic properties of Fe-rich amorphous alloys produced by a single-roller type quenching method was examined.The properties obtained are significant in high values of the saturation magnetic induction and in low values of the coercive force and the ac core loss.The composition of metalloids as well as the conditions for the fabrication of amorphous ribbons must be suitably chosen in obtaining the best properties. For example, the alloys of (Fe-Co)80(Si-B)20 in the range of Co/Fe+Co=0.1-0.2 and Si/Si+B=0.25 exhibit about 16000G of saturation magnetic induction, about 7 mOe of coercive force, and about 2×106 of residual magnetic induction to coercive force ratio, which indicates approximately maximum permeability because of the high rectangularity of B-H hysteresis loops. In addition to these static properties, it has been found that these alloys exhibit very small ac core losses at 50Hz or further high frequencies.These magnetic properties have been quite stable against aging, promising that these alloys will be useful for practical use.
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