Koerzitivfelder

Koerzitivfelder, also known as coercive fields, are a fundamental concept in magnetism, specifically relating to ferromagnetic materials. They represent the strength of the magnetic field required to reduce the magnetization of a material to zero after it has been magnetized to saturation. In simpler terms, it's the "resistance" a magnetic material offers to being demagnetized. When a ferromagnetic material is exposed to an external magnetic field, its magnetic domains align, resulting in magnetization. If this external field is then removed, the material retains some of its magnetism (remanence). To completely demagnetize it, an opposing magnetic field, the coercive field, must be applied.

The value of the coercive field is a key characteristic that distinguishes different magnetic materials. Materials with a high coercive field are known as "hard" magnetic materials, meaning they are difficult to magnetize and demagnetize. These are often used in permanent magnets. Conversely, materials with a low coercive field are "soft" magnetic materials, easily magnetized and demagnetized. They are typically used in applications like transformer cores and electromagnets where rapid changes in magnetization are needed. The coercive field is influenced by factors such as the material's composition, crystal structure, and the presence of impurities or defects. It is a crucial parameter for understanding and selecting materials for various magnetic applications.