What is permeability, we divide the magnet into permanent magnet and soft magnetic these two categories, the difference between the coercivity size is permeability. Soft magnetic materials have relatively high permeability, small magnetic loss and strong stability. After all, soft magnetic materials can be used by continuous demagnetization, so high permeability can quickly adapt to changes in the external magnetic field. The higher the coercivity of permanent magnet materials, the lower the permeability, because it requires high magnetic energy product, high Curie temperature and good stability. Generally speaking, after magnetization, it will not be as frequent as soft magnetic demagnetization, so there is no need for high permeability. If it is more attention to the property of conduction, then soft magnetic materials will be more appropriate.
The permeability of general NdFeb at room temperature is about 1.05, and it can reach about 1.02. Permeability is a physical quantity that indicates the permeability of magnetic medium. μ is the ratio of magnetic induction intensity B to magnetic field intensity H in magnetic medium, μ=B/H=μ0×μr, where μ0 is the vacuum permeability and μr is the relative permeability of medium. According to the size of μr, the medium can be divided into paramagnetic substance (μr > 1), diamagnetic substance (μr < 1) and ferromagnetic substance (μr > 1)
