Magnetic coercivity - definition
Magnetic coercivity - definition
Magnetic coercivity is a physical quantity that describes the ability of a ferromagnetic material to resist demagnetisation. It is defined as the value of the intensity of an external magnetic field that must be applied in the direction opposite to the original magnetisation of a material in order to completely reduce its magnetisation (i.e. bring the magnetisation to zero). Coercivity is one of the key parameters characterising the magnetic properties of materials and is expressed in units of magnetic field strength (e.g. A/m or Oe).
This phenomenon is an integral part of the hysteresis curve magnetic curve, which describes the relationship between magnetic field and magnetic induction in a material. The point of intersection of this curve with the field axis at zero induction corresponds precisely to the coercivity value. The greater the coercivity, the greater the field that must be applied to reverse the direction of magnetisation, which means that the material exhibits high magnetic durability and resistance to external fields.
Materials with high coercivity, called hard ferromagnets, are used to make permanent magnets that retain their magnetic properties for long periods of time. Examples include neodymium-iron-boron (NdFeB) alloys or ferrite ceramic magnets. In contrast, low-coercivity materials, known as soft magnets, are easily magnetised and demagnetised, making them ideal for applications in transformer cores, coils and electronic circuits where rapid variation of magnetic state is important.
Magnetic coercivity depends on many factors, such as the crystal structure of the material, the presence of dopants, stresses internal, heat treatment and grain size. In materials engineering and electronics, accurate determination and control of coercivity enable the design of magnetic components with desired functional properties, tailored to specific industrial, energy and IT applications.
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