Patent ID: 8007600
Filing Date: 2011-08-30
Classification: C22C,H01F

Abstract:
1. A method for producing a soft magnetic thin ribbon, comprising the steps of: casting an alloy melt into a shape of an amorphous thin ribbon having a thickness of not greater than 100 μm, the alloy having a composition represented by a formula: Fe the alloy including crystalline grains having a size of not greater than 30 nm precipitated in a volume fraction of not more than 1%, including 0%, in an amorphous phase, and the amorphous thin ribbon being able to be bent at 180 degrees; working the amorphous thin ribbon with a cutting tool; and then annealing the amorphous thin ribbon at an average heating rate of not less than 100° C./min in a temperature range from 300° C. to an annealing temperature, the annealing temperature being higher than a crystallization temperature, to obtain a soft magnetic thin ribbon having a structure where crystalline grains having a grain size of not greater than 60 nm (excluding 0) are dispersed at a volume fraction of not less than 30% in an amorphous phase.