What are the external factors that affect the magnetic properties of magnetic materials?
Temperature. The temperature has a remarkable influence on the magnetic properties of magnetic materials. Generally, the permeability and saturation magnetic induction of metallic magnetic materials decrease with the increase of temperature. When the temperature exceeds a certain value, the magnetic material will lose magnetism and become paramagnetic material.
In addition, the magnetic properties of magnetic materials depend not only on their chemical composition, but also on the method of mechanical processing and the conditions of heat treatment. When the metal magnetic material is machined, internal stress is produced. This force can decrease the permeability of the material, increase the coercivity and increase the loss. In order to eliminate stress and restore magnetism, annealing must be carried out.
Frequency. The change of frequency also has some influence on magnetic properties. When the frequency increases, the magnetic conductivity of the material decreases and the core loss increases.
