Structure and Magnetic Properties of Thick-Fe-Based Glassy Alloy Ribbons

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Abstract
The structure and magnetic properties of melt-spun multicomponent Fe72Ga2Al5P11-xC6B4Six (x=0, 1) with thicknesses 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 (tmax) and a supercooled liquid region (ΔTx). The values of tmax and ΔTX are 140 μm and 51 K for Fe72Ga2Al5P11C6B4 and 160 μm and 58 K for Fe72Ga2Al5P10C6B4Si1. The soft magnetic properties of the Fe-based glassy alloy containing 1 at%Si are comparable to those of Fe78Si9B13 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.