We have tried to prepare the thick Fe70Al5Ga2P9.65C5.75B4.6Si3 amorphous sheets with the sample width of 15 mm and investigated the relation between glass-forming ability and soft magnetic properties. The sheets can be made of single amorphous phase by single-roller melt spinning method with the thickness up to 100 μm. High relative permeability of 5500 at f=1 kHz and low core loss of 0.15 Wkg-1 at f=50 Hz and Bm=1.0 T are obtained at the sample thickness of 87 μm. The relative permeability under 30 kHz and the core loss under 300 Hz do not depend upon the sample thickness. It is considered that the soft magnetic properties of the Fe-Al-Ga-P-C-B-Si glassy alloys are concerned with their structural homogeneity caused by high glass forming ability. These soft magnetic properties allow us to expect the Fe-Al-Ga-P-C-B-Si glassy alloy sheets are practically used as industrial materials.
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Yōshida et al. (1999) studied this question.
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