Magnetic Fields in A Material
See also: Magnetic field#H and B inside and outside of magnetic materialsIn a vacuum,
where μ0 is the vacuum permeability.
In a material,
The quantity μ0M is called magnetic polarization.
If the field H is small, the response of the magnetization M in a diamagnet or paramagnet is approximately linear:
the constant of proportionality being called the magnetic susceptibility. If so,
In a hard magnet such as a ferromagnet, M is not proportional to the field and is generally nonzero even when H is zero (see Remanence).
Read more about this topic: Magnetism
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