| Definition: | in a graphic representation of the relation between the magnetic flux density and the magnetic field strength relation in a material, a region near the origin within which the flux density can be described by a quadratic function of the field strength:
X
where B is the magnetic flux density
µ0 is the magnetic constant
µi is the initial permeability
H is the magnetic field strength
X is the peak value of H
and v is the Rayleigh hysteresis coefficient
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