Hard magnetic materials are relative to soft magnetic materials. It refers to a type of ferrite material that is not easily demagnetized after magnetization and can retain magnetism for a long time. Therefore, sometimes also known as permanent magnet materials or permanent magnet materials

The crystal structure of hard magnetic materials is mostly hexagonal magnetic lead stone type. Its typical representative is barium ferrite BaFe12O19 (also known as barium permanent porcelain or barium magnetic porcelain), which is a ferrite hard magnetic material with good performance, low cost, and suitable for industrial production.

This material can not only be used as a magnet for recorders, microphones, pickups, telephones, and various instruments in telecommunications devices, but also has been applied in pollution treatment, medical biology, and printing displays.

Hard magnetic ferrite material is the second main hard magnetic material after aluminum nickel drill series hard magnetic metal material. Its appearance not only saves a large number of Strategic material such as nickel and drill, but also opens up a new way for the application of hard magnetic materials in high frequency band (such as TV parts, microwave devices and other national defense devices)