What are the magnetic polarization intensity ( J ) and magnetization ( M ) of permanent magnets?

　　Modern magnetic studies show that all magnetic phenomena of permanent magnets is begun from the current. Magnetic material has no exception, the ferromagnetic material is originated from a tiny current, formed by the internal atomic extra-nuclear electron movement, also known as molecular current.

　　These micro current's collection effect makes the material foreign presents various macroscopic magnetic properties. Because every micro current produces magnetic effect, the unit current is called a magnetic dipole. The definition of maximum torque produced by the vacuum per unit to external magnetic field is magnetic dipole moment pm. The magnetic dipole moment vector and magnetic polarization intensity J within per unit volume of material within, its units is T ( Tesla, in CGS system of units in the unit, J Gs, 1T=10000Gs ).

　　Definite that a magnetic dipole moment is 0μpm/ μ0, μ0 is permeability of vacuum, the magnetic moment vector sum within per unit volume is magnetization M, the SI unit is A/m, and CGS unit is Gs ( Gauss ).