Iron core made of soft magnetic material

If you use a soft magnetic materiallike silicon steel to make the core, these materials are easily magnetized, so both Permalloy Cores and silicon steel are considered to have high permeability. In fact, the cores of many electromagnets and solenoids are made of iron or silicon steel precisely because of the excellent permeability of these materials.

Magnetic permeability is the ratio of magnetic flux density to magnetizing force. This means that if the magnetic flux density is high and the magnetizing force is low, the magnetic permeability will be low; conversely, if the magnetic flux density is low and the magnetizing force is high, the magnetic permeability will be high. This property is crucial in the design and selection of Soft Magnetic materials.

When discussing soft magnetic materials, iron and silicon steel also have low remanence and low coercivity, which make them excellent magnetic materials. Not only are they easily magnetized (low coercivity), but they also exhibit low remanence when demagnetized. This is partly due to their high permeability. In addition, the addition of silicon to silicon steel can effectively reduce eddy current losses and improve the long-term stability of the steel, allowing its characteristics to remain unchanged for a long time.

By observing the hysteresis loop, we can obtain important information about the material’s magnetic permeability. Generally, materials with high magnetic permeability will show high and narrow hysteresis loops, while materials with low magnetic permeability will show wider hysteresis loops. This phenomenon reflects the degree of energy loss of the material in a magnetic field.

The shape of the hysteresis loop is influenced by a variety of factors that together determine the material’s magnetic properties. Magnetic materials with narrow hysteresis loops generally have higher permeability, while materials with wider hysteresis loops exhibit lower permeability. Therefore, understanding these properties is critical to optimizing design and improving device performance when selecting soft magnetic materials.