Material can be divided into ferromagnetism, ferrimagnetism, paramagnetism, diamagnetism, and anti-ferromagnetism based on their magnetism behavior and bulk magnetic susceptibility. Materials with ferromagnetism or ferrimagnetism are collectively referred to as magnetic materials. Magnetic materials can be further subdivided into soft magnetic materials, permanent magnetic materials, gyromagnetic materials, rectangular hysteresis materials, and piezomagnetic materials. Soft magnetic material which otherwise known as soft magnet, is a corresponding concept against hard magnet. Those unfamiliar with magnetism are easy to misinterpret “soft” and “hard” from literally or material hardness, then mistake soft magnet for rubber magnet. In reality, the words “hard” and “soft” here is not mechanical but magnetism. Soft magnetic material is a type of magnetic material which able to quickly respond to change of the external magnetic field and obtain high magnetic flux density under low loss. Soft magnet possesses low coercivity and high permeability, therefore, it can be easily magnetized and demagnetized. Soft magnetic material is widely used in magnetic cores of transformers, inductors, motors, and generators.
