D Magnetization B is provided by the material itself, in addition to being directly supplied by the magnetic field strength. This is called the intrinsic magnetic induction intensity or magnetic polarization Ψ→, ie: M→ has the same rhyme dimension as H→ (unit is am/m). Magnetization is produced by orbital motion and spin of electrons in a material atom. If each magnetic atom contributes a magnetic moment of pm→ in the same direction, and the magnetic atoms are uniformly distributed, the density is n per cubic meter, thus: Pm is customarily considered to be the bulk density of a magnetic charge or a magnetic pole. Where σ m — the areal density of the magnetic poles; F Magnetic susceptibility The ratio of magnetization to magnetic field strength is called magnetic susceptibility or volume susceptibility (no dimension) Where δ—the density of matter, kg/m 3 .x5 is one of the most commonly used quantities. Where V is the particle volume, m 3 ;
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At the interface between materials 1 and 2,
n→——- The normal unit vector of the direction from material 1 to material 2. [next]
Although the magnetic charge or magnetic pole does not exist as a separate physical entity, it is a useful concept because it can solve the magnetostatic problems similar to electrostatics. Similar to the electric field established by the charge, the magnetic charge q m establishes a magnetic field. The magnetic pole often appears in opposite polarity or in the opposite direction, so the overall net magnetic charge is zero.
For ferromagnetic materials, the concept of relative permeability μr is more useful than magnetic susceptibility.
gradH—the gradient of the magnetic field strength, A/m 2 .
The object is placed in the external magnetic field H, and its internal magnetic field H O is not equal to the external magnetic field, which is related to the shape of the object:
H O =HH d (31)
Where H d =N d H———the strength of the object's demagnetizing field, A/m;
N d — Demagnetization factor, determined by the shape of the object and its position in the magnetic field.
The demagnetization factor is an important parameter that affects the behavior of ferromagnetic particles in a magnetic field.