The magnetic field intensity needed to reduce the magnetization of a ferromagnetic material from complete saturation to zero, usually measured in teslas.
The magnetic intensity, usually measured in oersteds, needed to completely demagnetize a substance that has been fully magnetized.
The magnetic flux density needed to reduce the magnetization of a material (especially a ferromagnetic material) from complete saturation to zero. Coercivity is measured in teslas.
On magnetic media, the amount of electrical energy required to change the polarization of a bit. The coercivity of hard disks ranges from 500 to 2,000 Oersted. On magneto-optic media, it takes between 5,000 to 10,000 Oersted. See Oersted.
(physics, materials science) The intensity of the magnetic field which must be applied in order to reduce the magnetization of a ferromagnetic material to zero after the magnetization of the sample has been driven to saturation.
The coercive force, or coercivity, of a material is that reversed magnetic force which, while it is acting, just suffices to reduce the residual induction to nothing after the material has been temporarily submitted to any great magnetizing force.
They typically have intrinsic coercivity less than 1000 Am -1.
However, it is possible to derive a physically based model which relates coercivity to grain size.
Due to their anisotropic structure they exhibit relatively high coercivity, however, the energy product is low.
These terms are short for high and low coercivity.