FIELD: metallurgy, in particular, amorphous magnetically soft alloys; applicable in electrical installations, for instance, in magnetic circuits and high-frequency transformers. SUBSTANCE: alloy contains iron, nickel, alloying components and components for rendering alloy amorphous in the form of silicon and boron in the following ratio, atom-%: cobalt, 58-66; nickel, 2-9; iron, 3-4; silicon, 13-14; boron, 12-12.8; and alloying components: manganese, 0.8-2.2; chromium, 1.3-1.5. Total content of cobalt and nickel is 67.1-68.3 atom-%. Total content of iron and manganese is 5-5.2 atom-%. Total content of chromium, silicon and boron is 26.5-27.9 atom-%. EFFECT: higher efficiency of high-frequency transformers made of the offered alloy. 4 cl, 2 tbl
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