| of a material saturated by a magnetostatic field, the complex permeability when it is subjected to an electromagnetic wave having a circularly polarized H field component in the plane perpendicular to the magnetostatic field strength:
μ + = μr + Kr
μ - = μr - Kr
where μr and Kr are components of Polder's tensor permeability
NOTE – The subscript of µ corresponds to the sign in the mathematical expression ; μ + is applicable where X field rotates counterclockwise as a function of time when seen in the direction of the applied magnetostatic field ; μ - is applicable to the reserve rotation.
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