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coercive force

The coercive force is a measure of the magnetic field strength required to completely eliminate the residual magnetism of a magnetic storage medium. The coercive force is also referred to as the coercive field strength and corresponds to the magnetic field strength required for demagnetization

. Magnetized materials retain a residual magnetism, remanence, after a magnetic field is removed. This is due to the orientation of the molecular magnets. This residual magnetism is only compensated for by an opposing magnetic flux. The force that must be applied for this is the coercive force. It is expressed in amperes

per unit length (A/m) and depends on the magnetized material and the persistence of the molecular magnets, which are more or less strongly bound in their position. A distinction is therefore made between soft magnetic materials, which have a low coercive force, and hard magnetic materials, which have a high coercive force.

Hysteresis curve with new curve of a ferromagnetic material

Hysteresis curve with new curve of a ferromagnetic material

The coercive force must be applied in the form of magnetic field strength during the erasure process of a diskette, magnetic tape or magnetic disk in order to bring the oxide crystals out of the stable remanence point.

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Englisch: coercive force
Updated at: 29.09.2011
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