Low-loss high-magnetic-flux-density iron-based amorphous soft magnetic alloy and preparation method thereof

The invention discloses a low-loss high-magnetic-flux-density iron-based amorphous soft magnetic alloy and a preparation method thereof, the molecular formula of the soft magnetic alloy is FeaCobBcSidCePfCug, a, b, c, d, e, f and g respectively represent atomic percentages of corresponding alloy elements, and meet the following conditions: 67 < = alt; 83, 0lt; b < = 16, 9 < = c < = 10, 2 < = d < = 5, 0 < = e < = 3, 0lt; f < = 4, 0 < = g < = 1, a: b > = 4, 81lt; a + blt; 84, a + b + c + d + e + f + g = 100. The preparation method comprises the following steps: carrying out induction melting on raw materials under a protective atmosphere to obtain a master alloy ingot, preparing an amorphous alloy strip by adopting a single-roller quenching method, and carrying out tensile stress heat treatment under a vacuum condition or an inert atmosphere to obtain the amorphous alloy. After tensile stress heat treatment, the soft magnetic performance of the alloy is greatly improved, the saturation magnetic flux density rea