Remanence is the magnetization left behind in a medium after an external magnetic field is removed. It is denoted in equations as Mr.
The remanence magnitude can be taken from a hysteresis loop at the intersections of the loop with the vertical magnetization axis.
Remanence has application in geology (concerning paleomagnetism), computer engineering (concerning data storage and recovery), and physics (concerning electromagnetics).
External links
Coercivity and Remanence in Permanent Magnets (http://hyperphysics.phy-astr.gsu.edu/hbase/solids/magperm.html)
Whereas the unrolled, unloaded sample possess a remanence in the range of 35% of saturation, the rolled, unloaded sample has a remanence in the range of 2 to 3% of saturation depending on the maximum field applied.
1, the remanence to saturation magnetization ratio is plotted against increasing load for the sample prior to rolling, and for the rolled sample with three different fields impressed thereon.
It may be seen that in all cases, the rolling has substantially reduced the unloaded remanence, but that the impressed magnetic field tends to push the remanence back upwardly toward that of the sample prior to rolling.
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