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Remanence or 'rest'-magnetism

Residual magnetism is often caused (either intentionally or unintentionally) by magnetic fields from the immediate vicinity, such as clamping tables, magnetic conveyors or induction heating. Other causes include arc welding, machining processes, cold forming and even mechanical vibrations.

Small demagnetizing unit     Magnetism in milling parts

 

The consequences of residual magnetism may be desirable, problematic or even very costly. A nut that clings to the end of a screwdriver is handy, but two products that stick together in a mould disrupt production, resulting in financial losses. Other possible consequences of undesired magnetism: a coarse surface after galvanization, welds that only penetrate on one side, rapid wear of bearings, or metal chips that stick to the parts.

These consequences can be avoided by demagnetizing the material.

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Anisotropic

When magnetic material is pressed in a magnetic field, this material is called preferentially-oriented and anisotropic. Anisotropic material can only be magnetized in the preferential orientation.

Magnet materials

Ferrite
magnets
 

Ferrite magnets Read more

Neodymium (Neoflux®) magnets

Neodymium Neoflux Magneten Read more

Samarium-cobalt magnets
 

Samarium Kobalt magneten Read more

Aluminum-nickel-cobalt magnets

Aluminum-nickel-cobalt magnets Read more

Plastic bonded magnets
 

Plastic bonded magnets Read more