Bulk ferromagnetic glasses prepared by flux melting and water quenching

Several ferromagnetic bulk amorphous alloys of the type Fe–(Co, Cr, Mo, Ga, Sb)–P–B–C, containing between 62 and 71 at. % Fe, have been prepared in the form of 4-mm-diam rods. The glass synthesis consists of mechanically alloying the constituents, purifying the melts in $B2O3$ flux inside fused silica tubes, and quenching the melts at cooling rates on the order of 100 K/s. All these glasses have a large supercooled region $Tx−Tg,$ ranging from 35 to 61 K, within which the glass can be shaped under a relatively small applied load. It is shown that the value of $Tx−Tg$ depends strongly on the metalloid composition. These bulk metallic glasses have very low coercivity and low hysteresis losses.