Magnetic properties of 6.5 percent silicon-iron ribbon formed by a melt spinning technique

Silicon-iron alloys containing 6.5 percent silicon can be formed into ribbons by a melt spinning technique. The ribbons obtained were 10-40 μm in thickness, 1-2 mm in width, and 5-10 m in length, and after annealing all of them were remarkably flexible so as to be bent 180°. The as-quenched ribbons are crystalline and are not amorphous. Low loss is maintained for frequencies up to 50 kHz for 15-μm thick 6.5 percent silicon-iron ribbons. The values obtained for as-quenched ribbon were relative permeability
\mu_{R} = 6000
, and loss per cycle
W_{f}/f= 30
mJ/kg, measured at a maximum induction of 0.8 T and frequency of 50 kHz.