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The grain diameters and magnetic properties of rapidly quenched Fe-M-Si-Ge (M=Ti, V, Zr, Nb, Ta) and Fe-Hf-Cu alloy ribbons were investigated. The grain size of Fe-Ta-Si-Ge alloys decreases rapidly from 2700 ?? to about 400 ?? with the addition of up to 3 at% Ta. The coercivity increases rapidly from 2.3 to 30 Oe with increasing Ta content. For the Fe-M-Si-Ge alloy systems, the decrease in grain diameter...
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