厚いFe基金属ガラス合金薄帯の構造と磁気特性 (<特集>ソフト材料)

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The structure and magnetic properties of melt-spun multicomponent Fe_<72>Ga_2Al_5P_<11-x>C_6B_4Si_x (x=0,1) with thick-nesses from 20 to 440 μm were investigated. The addition of 1 at% Si instead of P to Fe-Ga-Al-P-C-B glassy alloy was found to be effective for extending the critical thickness to maintain a single amorphous phase (t_<max>) and a supercooled liquid region (ΔT_x). The values of t_<max> and ΔT_x are 140 μm and 51 K for Fe_<72>Ga_2Al_5P_<11>C_6B_4, and 160 μm and 58 K for Fe_<72>Ga_2Al_5P_<10>C_6B_4Si_1. The soft magnetic properties of the Fe-based glassy alloy containing 1 at%Si are comparable to those of Fe_<78>Si_9B_<13> amorphous ribbon with a thickness of under 70 μm, and better than those of the same ribbon with a thickness of over 70 μm. It is therefore expected that the Fe-based glassy alloy containing 1 at%Si will be widely used as a bulky amorphous material with good soft magnetic properties.
1997-04-15