Magnetic polarization

Physical size
Surname	Magnetic polarization
Size type	Magnetic flux density
Formula symbol	J
Size and unit system unit dimension SI T M · I −1 · T −2

The magnetic polarization is a physical quantity from the field of electrodynamics of macroscopic media. It characterizes the magnetic flux density within a magnetic material minus the portion of the magnetic field in the vacuum. It is therefore also referred to as the intrinsic magnetic flux density . Your formula symbol is . It is specified in the International System of Units (SI) in the unit Tesla . ${\displaystyle J}$

definition

The magnetic polarization is defined as the difference between the magnetic flux density  B _m with matter and the magnetic flux density B ₀ in a vacuum at the same magnetic field strength : ${\displaystyle H}$

${\displaystyle {\begin{aligned}J&=B_{m}-B_{0}\\&=B_{m}-\mu _{0}\cdot H\end{aligned}}}$

with the magnetic field constant . ${\displaystyle \mu _{0}}$

Connections

${\displaystyle J}$ is connected:

• with the vacuum flux density over the magnetic susceptibility : ${\displaystyle B_{0}}$ ${\displaystyle \chi _{m}}$

${\displaystyle J=\chi _{m}\cdot B_{0}}$

• with the magnetization of the medium via the magnetic field constant : ${\displaystyle M}$ ${\displaystyle \mu _{0}}$

${\displaystyle J=\mu _{0}\cdot M}$.

literature

• Horst Stöcker (Ed.): Pocket book of physics. Verlag Harri Deutsch, Thun / Frankfurt am Main 2000, ISBN 3-8171-1627-6 .

See also

• Macroscopic Maxwell's equations
• dielectric polarization
• ferromagnetic
• paramagnetic
• diamagnetic