A ferrite magnet is a metal oxide that has ferromagnetic properties. In terms of electrical properties, ferrite has much greater resistivity than metallic and alloy magnetic materials, and also has higher dielectric properties. The magnetic properties of ferrite are also characterized by high permeability at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the field of high-frequency weak electricity. It is a non-metallic magnetic material, which is a compound oxide (or orthoferrite) of ferric oxide and one or more other metal oxides. The magnetic force is usually 800-1000 gauss, and it is often used in speakers, horns and other instruments.
The advantages of NdFeB magnets are that they are cost-effective and have good mechanical properties; The disadvantage is that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to pulverize and corrode, and it must be improved by adjusting its chemical composition and taking surface treatment methods to meet the requirements of practical application. NdFeB belongs to the third generation of rare earth permanent magnet materials, which has the characteristics of small size, light weight and strong magnetism, and is the magnet with the best performance-to-price ratio at present, and is known as the magnetic king in the magnetic community. The advantages of high energy density have made NdFeB permanent magnet materials widely used in modern industrial and electronic technology. In the state of bare magnetism, the magnetic force can reach about 3500 gauss.