Patent ID: 8182620

Claim:
A method for producing a magnetic alloy, comprising the steps of quenching an alloy melt comprising Fe and a metalloid element to produce a Fe-based, fine crystalline alloy having a structure in which crystal grains having an average diameter of 30 nm or less are dispersed in an amorphous matrix in a proportion of more than 0% by volume and 30% by volume or less, and heat-treating said Fe-based, fine crystalline alloy to have a structure in which body-centered-cubic crystal grains having an average diameter of 60 nm or less are dispersed in an amorphous matrix in a proportion of 30% or more by volume, wherein said magnetic alloy has a saturation magnetic flux density of 1.7 T or more, a coercivity of 24 A/m or less, and a composition represented by the following general formula (1): Fe 100-x-y Cu x B y (atomic %) (1), wherein x and y are numbers meeting the conditions of 0.1≦x≦3, and 10≦y≦20.