jäännösmagnetisaatiolla

Jäännösmagnetisaatio refers to the residual magnetism that remains in a ferromagnetic material after the external magnetic field that caused it has been removed. This phenomenon is a key property of magnetic materials and is fundamental to technologies such as magnetic storage and permanent magnets.

When a ferromagnetic material is exposed to a magnetic field, its magnetic domains, which are microscopic regions with aligned magnetic moments, orient themselves in the direction of the applied field. Even after the external field is withdrawn, a significant portion of this alignment persists, resulting in the material retaining a magnetic field of its own. The strength of this remanent magnetization depends on the material's composition, its magnetic history (how it was magnetized), and its coercivity, which is a measure of its resistance to demagnetization.

Materials with high remanent magnetization and high coercivity are desirable for applications requiring strong and stable permanent magnets, such as in electric motors, generators, and magnetic resonance imaging (MRI) machines. Conversely, materials with lower coercivity might be used in applications where the magnetism needs to be easily switched, such as in magnetic recording media. The study and understanding of jäännösmagnetisaatio are crucial for developing and optimizing these technologies.