koercivitással

Koercitivitás refers to the property of a ferromagnetic material that describes its resistance to changes in magnetization. When a magnetic field is applied to a ferromagnetic material, its magnetic domains align, causing the material to become magnetized. When the external magnetic field is removed, some residual magnetism may remain. Koercitivitás is the strength of the magnetic field required to demagnetize the material, i.e., to reduce its magnetization to zero.

Materials with high koercitivitás are called hard magnetic materials and are difficult to magnetize and demagnetize. They are suitable for permanent magnets. Materials with low koercitivitás are called soft magnetic materials. They are easily magnetized and demagnetized, making them useful in applications like transformer cores and electromagnets where the magnetic field needs to change rapidly.

The koercitivitás is an important parameter in characterizing magnetic materials and determining their suitability for various technological applications. It is typically measured in amperes per meter (A/m) or oersteds (Oe). The hysteresis loop of a magnetic material graphically represents its magnetic properties, and the width of the loop along the magnetic field axis at zero magnetization indicates the koercitivitás. A wider loop signifies higher koercitivitás.