Better magnetic material for help
Soft magnetic material requires high permeability (especially initial permeability), small magnetic loss and good stability. Because the soft magnetic is constantly magnetized, demagnetization, so high permeability can be its very fast corresponding changes in the external magnetic field, of course, the higher the better. Commonly used soft magnetic are pure iron, ferrosilicon and gold, iron nickel alloy (known as permalloy) and some ferrite
Permeability is defined as the slope of the magnetization curve, the ease of simple speaking is magnetic magnetization, and coercive force is just opposite.
If it is to pay attention to permeability, then it should be soft magnetic material. In general this material can be divided into soft magnetic materials and magnetic materials. The difference between the two is the magnitude of the coercivity, which can be interpreted as the magnitude of the applied magnetic field which must be applied to the disappearance of the magnetic force.
Hard magnetic materials: magnetic product can, high coercive force, high Curie temperature and good stability. Hard is the permanent magnet, usually after the first is not like the magnetized soft magnetic demagnetization as often, so it is not necessary for high permeability.
