PURPOSE:To obtain a magnetic alloy with high permeability, by heat-treating the alloy containing each preseribed amount of Si, Al and Fe and/or further a prescribed amount of at least one element of V, Nb, Ta, Cr, Mo, etc. as auxiliary components on a specific condition. CONSTITUTION:The alloy comprising 4-13wt% Si, 4-13wt% Al and 75- 92wt% Fe and/or further 0.01-5wt% in total of at least one element of V, Ng, Ta, Cr, Mo, W, etc. is molten. Next the molten metal is primarily heat-treated at 950-1,300 deg.C. Subsequently it is cooled at a temperature gradient of 0.1-1 deg.C/sec. After cooling to a room temperature, the alloy is secondarily heat-treated at 300- 800 deg.C and then cooled at a rate of 0.1 deg.C/sec or less.
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