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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.1)

See also the main article: Process of demagnetisation.

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

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.2)
Simplified illustration of demagnetisation: a) uni-directional excitation with magnetic field strength H with alternating and reducing amplitude causes the magnetic flux density B (related to the level of magnetisation M) so that the material can be demagnetised to the ideal point of H = 0, B = 0, and b) under two-dimensional or rotational magnetisation it might be more appropriate to reduce excitation in a form of a 2D (or even 3D) spiral, so that all the axial components such as Bx and By are reduced towards zero
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demagnetisation.txt · Last modified: 2024/06/05 14:21 by stan_zurek

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