Amorphous Co-based alloy with low losses at high frequencies

On the basis of CoMn a new amorphous alloy with a saturation flux density Bs= 0.8 T and very low magnetostriction λsis presented. Tailored hysteresis loops and excellent magnetic properties can be obtained by a systematic variation of the cooling rate with and without a magnetic field. High permeabilities μaat 50 Hz are found for round loops. For flat hysteresis loops, a constant permeability up to about 1 MHz can be adjusted. The iron losses pFeat 100 kHz at the same time, are very low and comparable to the classically calculated eddy current losses.