demagnetiseres

Demagnetiseres is a verb form used in Danish and Norwegian (present passive), meaning “to be demagnetized” or “is demagnetized.” In English, the corresponding concept is demagnetization, the reduction or elimination of a material’s magnetic order and net magnetization. The term is typically applied to ferromagnetic materials such as iron or steel that can retain residual magnetism after exposure to a magnetic field.

Demagnetization occurs when a material’s remanent magnetization is reduced toward zero. This can happen naturally over time or be produced deliberately to remove stray magnetic fields that might interfere with instruments or processes. Materials with high coercivity or strong residual magnetization are harder to demagnetize.

Common methods for inducing demagnetization include:

- Thermal demagnetization: heating the material above certain temperatures (often near or above the Curie point) and then cooling in a zero-field environment.

- Degaussing or AC demagnetization: exposing the object to a gradually diminishing alternating magnetic field, which cancels out previous magnetization.

- Mechanical or reverse-field demagnetization: applying specific magnetic field sequences or physical agitation to disrupt aligned domains.

Applications and considerations:

- Degaussing is used to erase data on magnetic storage media and to remove unwanted magnetism from devices, tools, or shielding components.

- Demagnetization is important in manufacturing, inspection, and safety contexts to prevent interference, magnetic contamination, or attraction of ferromagnetic particles.

- Not all materials demagnetize easily; permanent magnets may require strong fields or thermal treatment, and some changes can be irreversible or alter material properties.

See also: demagnetization, degaussing, magnetism.