What is the magnetism of the material?
According to the molecular current hypothesis, matter should exhibit roughly similar properties in a magnetic field, but here it tells us that the properties of matter in the external magnetic field vary considerably, reflecting the limitations of the molecular current hypothesis. In fact, the microstructure of various substances is different, and the difference in the structure of this material is the reason for the difference in magnetic properties. Applications of magnetic materials -- transformers
Experiments show that any substance can be magnetized more or less in an external magnetic field, but only in varying degrees of magnetization. According to the characteristics of a substance in an external magnetic field, matter can be divided into five classes: paramagnetic, diamagnetic, ferromagnetic, sub magnetic, diamagnetic.
Magnetic material is an old and widely used functional material, and the magnetism of material has been recognized and applied as early as 3000 years ago. For example, in ancient China, natural magnets were used as the compass. Modern magnetic materials have been widely used in our daily life, such as the permanent magnetic material is used as the core material used in motor, transformer, magnetic disc memory used as magnetic recording by computer, such as floppy disks. It can be said that magnetic materials are closely related to information, automation, mechatronics, national defense and the national economy. It is generally believed that a magnetic material is a substance that produces magnetism directly or indirectly by excessive elements such as iron, cobalt, nickel, and their alloys.
