Development of soft magnetic materials The application of soft magnetic materials in industry began at the end of the nineteenth century. With the rise of power industry and telecommunications technology, began to use low carbon steel manufacturing motor and transformer, in the telephone line in the inductor core of the use of fine iron powder, iron oxide, fine iron wire. By the early 20th century, silicon steel sheets had been developed to replace low-carbon steel, improving transformer efficiency and reducing losses. Until now, silicon steel sheet is still the first soft magnetic material used in the electric power industry. In the 1920s, the rise of radio technology promoted the development of highly conductive materials, such as Permoly and Permoly magnetic core. From the 1940s to the 1960s, it was a period of rapid development of science and technology, the invention of radar, television broadcasting, integrated circuit, etc., the requirements of soft magnetic materials are also higher, the production of soft magnetic alloy thin strip and soft magnetic ferrite materials. In the 1970s, with the development of telecommunications, automatic control, computer and other industries, soft magnetic alloy for magnetic head was developed. In addition to the traditional crystalline soft magnetic alloy, another kind of material, amorphous soft magnetic alloy, emerged.

　　2. Types of commonly used soft magnetic core iron, cobalt, nickel three ferromagnetic elements are the basic components of magnetic materials. According to (main components, magnetic characteristics, structural characteristics) product shape classification:

　　1). Alloy: silicon steel sheet, Permo alloy, amorphous and nanocrystalline alloy

　　2). Powder core: magnetic powder core, including: iron powder core, ferrosilicon aluminum powder core, High Flux powder core (High Flux), Permo alloy powder core (MPP)

　　3). Ferrite class: It is a special powder core class, including: manganese zinc series, nickel zinc series

　　Classification and Properties of Commonly used Soft Magnetic Materials

　　Common alloy soft magnetic materials

　　Soft magnetic material

　　Common soft magnetic material with powder core

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