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PROBLEM TO BE SOLVED : To provide an Fe-based nanocrystalline alloy having high saturated magnetic flux density and high magnetic permeability, and to provide a manufacturing method therefor. SOLUTION : There is disclosed an alloy composition with the composition formula of FeaBbSicPxCuz, wherein the parameters meet the following conditions : 79≤a≤86 at%, 5≤b≤13 at%, 0
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