An ferrite magnet is a ferromagnetic metal oxide. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite also show high magnetic conductivity at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the field of high frequency weak electricity. A non-metallic magnetic material is a composite oxide(or ferrate) of iron oxide and one or more other metal oxides. The magnetic force is usually 800-1000 Gauss and is often used in speakers, horns and other devices.
The advantage of neodymium iron boron magnet is that it has high cost performance and good mechanical characteristics; The disadvantages are that Curie has low temperature points, poor temperature characteristics, and is prone to powdery corrosion. It is necessary to adjust its chemical composition and adopt surface treatment methods to improve it in order to meet the requirements of practical application. Neodymium iron boron belongs to the third-generation rare earth permanent magnetic material, which has the characteristics of small size, light weight and strong magnetism. It is currently the best magnetic body with the best performance price. It is known as the magnetic king in the magnetic field. The advantages of high energy density have made neodymium ferroboron permanent magnetic materials widely used in modern industrial and electronic technologies. In the naked magnetic state, the magnetic force can reach 3500 Gaosizuoyou.