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Degaussing - theory

Magnetic Work Pieces 

Causes of Magnetisation

The reasons for magnetization of work pieces are various. Fairly often, they cannot easily be ascertained in practice. The main causes are artificial magnetic fields acting in direct vicinity of the work pieces. These magnetic fields can be of intended or unintended origin, as for example: magnetic transport, induction hardening, magnet gripper, magnet chuck devices and others. Mechanical vibrations and cold forming under the influence of those magnetic fields reinforce or enhance the process of magnetization. The effects can be the following:

Principle

Inside a ferromagnetic crystal, a larger amount of atoms always has the same orientation. This area can be considered from the outside as a domain (Weiß domain); its volume ranges from 0.001 to
0.1 mm³. If these areas also have the same orientation, a work piece is magnetic.

Degaussing is achieved by reversing the homogenous orientation of the Weiß domains and thus creating an extreme disorder with the effect that the magnetic impact of the different areas is being neutralized.

In practice, mainly the following methods are used:

Since the degaussing effect of the alternating field is at its optimum only if it has the same orientation as the magnetic field of the work piece, divers methods of creating the degaussing field will be necessary (degaussing coils, degaussing yokes).

 

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