Definitions for "Demagnetizing"
Older magnets such as steel and alnico use to suffer from demagnetization (which is a severe lessening of their magnetic strength over time), when constructed in the small and thin sizes needed to be worn on the body in magnetic therapy. This occurred because the poles were too close to each other. But now used are the ferrite or more expensive rare earth magnets, which are resistant to this, and hence can be produced in the thin disc shapes which are regarded as the best for wearing next to the skin; for the better flow of magnetic fields from the surfaces of the magnet into the body of the wearer. (See also Ferrite and Rare Earth Magnets and Poles).