Soft Magnetic Properties of Fe-Based Glassy Alloys with High Saturation Magnetization.

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Abstract
The compositional dependence of the glass-forming ability and magnetic properties of Fe-Al-Ga-P-C-B- (Si) glassy alloys was investigated. The saturation magnetization (σs) increase with increasing Fe content. While the maximum thickness for glass formation (tmax) decreases when the (P, C, B) is replaced by Fe, it hardly does so when the (Al, Ga) is replaced by Fe. When P is replaced by Si, tmax increases. As a result, a high σs of 207 × 10-6 Wbm kg-1 and a large tmax of 220 μm were simultaneously obtained in a Fe77Al2.14Ga0.86P8.4C5B4Si2.6 glassy alloy. The core loss of this glassy alloy with a smaple thickness of 100μm at f=50 Hz and Bm = 1.0 T was 0.22 Wkg, which is lower than those of 6.5%Si-Fe alloy and amorphous Fe78Si9B13 alloy with the same sample thickness. Therefore, it can be said that the Fe-Al-Ga-P-C-B-Si glassy alloys are useful for inductive applications.