The application of soft magnetic materials in the industry began in the late 19th century. With the rise of electric power and telecommunications technology, low-carbon steels have been used to manufacture motors and transformers, and fine iron powder, iron oxide, and fine iron wire have been used in the core of the inductor coil in the telephone line. By the beginning of the 20th century, silicon steel sheets were developed instead of low carbon steel, which improved the efficiency of the transformer and reduced the loss. Until now, silicon steel sheets still rank first in soft magnetic materials for the power industry. In the 1920s, the rise of radio technology promoted the development of highly magnetically permeable materials, and the appearance of permalloy and permalloy magnetic powder cores. From the 40s to the 60s, it was a period of rapid development of science and technology. The inventions of radar, television broadcasting, and integrated circuits have higher requirements for soft magnetic materials, and soft magnetic alloy ribbons and soft ferrite materials have been produced. . In the 1970s, with the development of telecommunications, automatic control, computer and other industries, soft magnetic alloys for magnetic heads were developed. In addition to the traditional crystalline soft magnetic alloys, another kind of material was developed - amorphous soft magnetic alloy.