Ferrite magnetic material is a kind of sintered permanent magnetic material, which is composed of barium and strontium ferrite. In addition to its strong demagnetization resistance, this kind of magnetic material has the advantage of low cost. Ferrite magnetic materials are hard and brittle, which need special machining technology. The opposite magnet must be magnetized in the chosen direction because it is oriented in the manufacturing direction, while the same magnet can be magnetized in any direction because it is not oriented, although a slightly strong magnetic induction can be found on the compression surface, which is often the smallest side. The magnetic energy product ranges from 1.1mgoe to 4.0mgoe. Because of its low cost, ferrite magnetic materials have a wide range of applications, from motors, loudspeakers to toys and crafts, so it is the most widely used permanent magnetic materials.