Magnetic materials are generally strong magnetic substance, it is old and widely used functionality materials, the magnetism of material was known and used 3000 years ago, for example natural magnets used as a compass in ancient China. Modern magnetic materials already widely used in our life, for example, permanent magnets were used in motors. Magnetic materials have a close relationship with automation,mechanical-electrical integration etc.
We-Meank Magnetics just supply hard magnetic materials, which can permanently keep the magnetism after magnetized. So it also called as permanent magnetic materials. For permanent magnetic materials, after magnetized by external magnetic field, they can still keep most of the magnetism even if acted on reversing magnetic field. The requirements for such magnetic materials are high remanence(Br), strong coercive force(Hcb) and high maximum magnetic energy(BHmax).
Hard magnetic materials usually mean strong magnetic products and magnets. Hard magnets were classified according to use as below: hard ferrite magnets or ceramic magnets, NdFeB magnets（including sintered NdFeB magnets and bonded NdFeB magnets）, SmCo magnets, AlNiCo magnets and FeCrCo magnets, and flexible magnets(rubber magnets). Ferrite magnets are non-metal permanent magnets, others are metal permanent magnets. SmCo magnets and NdFeB magnets are rare earth magnets.
According to demagnetized easily or not, there are two families, one is a soft magnetic material which easily demagnetized, the other one is a hard magnetic material which is difficult to be demagnetized, which also called permanent magnet material.The remanence of soft magnetic material is lower, while remanence of hard magnetic material is higher.
The experiment shows any substance can be more or less magnetized by external magnetic field, just magnetic intensity different. According to the features performance in the external magnetic field, materials can be classified as paramagnetic materials, diamagnetic materials, ferromagnetic materials, ferrimagnetic materials and anti-magnetic materials. Paramagnetic materials and diamagnetic materials are known as weakly magnetic materials, while ferrimagnetic materials known as strong magnetic materials.