Demagnetisation

Stan Zurek, Demagnetisation, Encyclopedia Magnetica, https://www.e-magnetica.pl/doku.php/demagnetisation

* This page is being edited and may be incomplete or incorrect.

Demagnetisation - an effect or process in which there occurs a reduction in the amount of net magnetisation of the material, sample, component, or device.

See also the main article: Process of demagnetisation.

There are several specific meanings of “demagnetisation”, depending on the context:

Process of demagnetisation (or “degaussing”):
- by application of magnetic field
- by elevated temperature
Demagnetising field:
- Demagnetising factor
- Self-demagnetisation

Degaussing (demagnetisation) by applying AC excitation and slowly reducing the amplitude. In the example as shown the degaussing is incomplete because there is still some remaining net magnetisation (position of the dot in the graph of the hysteresis loop). The reason for incomplete degaussing could be too low initial amplitude or too quick decrease of the AC excitation.¹⁾