In the magnetic hysteresis loop showing the magnetic characteristics of a material, the remanence is the value of the flux density remaining when the external field returns from a high value of saturation to 0. The remanence is also called the residual magnetization. The higher the remanence value, the higher the useable magnetic flux density. The units for remanence are the Tesla [T] for SI units and the gauss [G] for the CGS unit system. The remanence is expressed as Br. For an isotropic material, the remanence is about 50% to 75% of the saturation magnetization, but for rare earth sintered magnet material, the remanence is about 95% or more of the saturation magnetization. This is due to the alignment of the easy magnetization axis with the magnetization direction.