抄録
The effects of chemical thinning after annealing were examined on two kinds of amprphous Fe-base alloy ribbons with different thicknesses (25, 60 μm) to further improve their core loss. The core loss of a 60μm thick ribbon continued to decrease with thickness reduction and reached a minimum (0.04 W /kg at 50 Hz and 1.3 T) at 10μm. This value is perhaps the least ever reported. On the other hand, for a 25μm thick ribbon treated in the same manner, a minimum of the core loss was as large as 0.09 W /kg. The very low core loss of a thick ribbon results from low hysteresis loss which remains constant in a wide thickness range during thinning. The low hysteresis loss of a thick amorphous ribbon is possibly due to its high structural homogeneity.
