jälkimagnetoitumisena
Jälkimagnetoitumisena, also known as remanence or residual magnetism, refers to the weak magnetic field that remains in a ferromagnetic material after the external magnetizing field has been removed. This phenomenon is a key characteristic of ferromagnetic substances and is a fundamental aspect of how they retain their magnetization. When a ferromagnetic material is exposed to a strong magnetic field, its magnetic domains align in the direction of the applied field. Upon removal of this external field, not all of these domains revert to their original random orientation. A portion of this alignment persists, resulting in a net magnetic moment within the material.
The strength of the jälkimagnetoitumisena depends on several factors, including the material's composition, its magnetic history