Ferrite magnets are metal oxides that are ferromagnetic. In terms of electrical properties, ferrite has a much higher resistivity than metal or alloy magnetic materials, and it also has higher dielectric properties. Ferrite also exhibits high permeability at high frequencies. Therefore, ferrite has been widely used in the field of high frequency weak current non-metallic magnetic materials. A nonmetallic magnetic material is a composite oxide (or orthoferrite) of magnetic iron oxide and one or more other metal oxides. Magnetic force is usually 800-1000 Gauss, often used in speakers, loudspeakers and other instruments.
The advantage of Neodymium iron boron magnet is cost-effective, with good mechanical properties; The disadvantage is low temperature point, poor temperature characteristics, and easy to powder corrosion, it must be adjusted by chemical composition and surface treatment methods to improve, to meet the requirements of practical application. Ndfeb belongs to the third generation of rare earth permanent magnet. Characterized by small size, light weight and strong magnetism, it is currently the best performance-to-price magnet and is known as the king of magnetism in the field of magnetism. The advantage of high energy density makes ndFeb permanent magnet widely used in modern industry and electronic technology. In the bare magnetic state, the magnetic force can reach about 3500 Gauss.