Explanation

In the presence of an external magnetic field, the relationship between the magnetic induction intensity and the magnetic field intensity of ferromagnetic and ferromagnetic materials can be represented by a curve. When the external magnetic field changes periodically, the relationship between the magnetic induction strength in these magnetic parts materials and the external magnetic field strength forms a closed curve, which is called the hysteresis loop. The area of the ffl wrapped by the magnetic hysteresis is equal to the energy consumed by the materials for one magnetize cycle of the external magnetic field. This energy is called magnetic hysteresis loss, which makes the temperature of materials rise. The shape of magnetic hysteresis will change with the type of materials, structure, ambient temperature and maximum external magnetic field strength. The magnetic hysteresis formed when the external magnetic field is strong enough to make the magnetic materials reach the saturation magnetization degree is called the saturation magnetic hysteresis. Saturated magnetic hysteresis is a magnetic hysteresis with the largest area of closed loop curve. The microscopic mechanism of the hysteresis loop is due to the large number of magnetic domain in the magnetic materials. These magnetic domain will adjust their own magnetic moment with the change of the strength and direction of the external field under the action of the external field, and will also lead to the change of the shape and size of the magnetic domain. After the external magnetic field disappears, the distribution of magnetic domain in the materials can not be completely restored, resulting in its remaining magnetism to some extent.

Classification