What are ferromagnetic materials?
Metal magnetic material refers to magnetic materials made of metal alloys or compounds, mostly in iron, nickel or cobalt based, then add other elements by high temperature melting, heat treatment and mechanical processing is made, the magnetic materials in high temperature, low frequency and high power conditions, has been widely used, but in high frequency the scope of its application is restricted. Metal magnetic materials can be divided into hard and soft magnetic and magnetoelastic materials, experimental results show that the hysteresis loops of different ferromagnetic materials have great differences, this gives three different ferromagnetic material hysteresis loop, the minimum area of soft magnetic material; magnetic material the high coercivity, remanence while large; loop ferrite material is approximately rectangular, it also known as the moment of magnetic materials.
The characteristics of soft magnetic materials is the relative permeability of Ur and saturation magnetic induction of Bmax are generally relatively large, but the coercivity of Hc than hard matter much smaller, surrounded by the hysteresis loop area is very small, the hysteresis is not significant, the soft magnetic material is easy to be magnetized in a magnetic field, but because of its coercive force is very small, so it is easily to magnetism, therefore, the soft magnetic material is another reason why it is suitable for the manufacture of iron core electromagnet, transformer, AC motor, alternator and other electrical appliances in the.
