Magnet Calibration and Stability
It is often required that the magnet maintains a very stable
magnetisation long after it has been magnetised and does not “droop”.
Although rare earth magnets and ferrite do not lose their magnetisation
after saturation as Alnico can, there is still a relaxation after
magnetisation that in some situations can be problematic.
Alternatively, it may be required that the magnet is calibrated (also
known as setting, treating or aging) to a particular level for use in a
If the magnet is “set” then it can be calibrated to a
particular level with the aid of an Integrating Fluxmeter, Gaussmeter
or other measuring technology as appropriate. Alternatively, the magnet
can be “knocked back” by applying a pulse in the opposite direction to
the sample to “knock back” the magnetisation, which greatly improves
the stability of the magnet.
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