Iron-cobalt-based nanocrystalline soft magnetic alloy with excellent comprehensive soft magnetic performance and preparation method of iron-cobalt-based nanocrystalline soft magnetic alloy

The invention discloses an iron-cobalt-based nanocrystalline soft magnetic alloy with excellent comprehensive soft magnetic performance and a preparation method thereof, the chemical composition of the iron-cobalt-based nanocrystalline soft magnetic alloy is FeaCobBcSidPeCuf, and the preparation method comprises the following steps: (1) weighing and mixing raw materials of iron, cobalt, boron, silicon, copper and an iron-phosphorus intermediate alloy according to atomic percent; (2) carrying out induction melting on the prepared raw materials under inert protection, and cooling to obtain a master alloy ingot with uniform components; (3) preparing the mother alloy ingot into an amorphous alloy strip by adopting a single-roller quenching method; and (4) the amorphous alloy strip is subjected to longitudinal magnetic field heat treatment, and the iron-cobalt-based nanocrystalline soft magnetic alloy is obtained after heat treatment is finished. A microstructure and a magnetic domain structure are effectively reg