MAGNETISING FIELD STRENGTHS
The field strength required for full magnetisation (to saturation) varies with the mineral of the magnet. These figures show the necessary field strengths for the various materials.
The curves are typical of the material groups, based on experimental values, and show the field strength for the initial magnetisation (initial curve). Altering the magnetisation or remagnetising components that have been demagnetised in alternation fields require considerably higher field strengths.