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Electromagnetic Material

Electromagnetic absorbers are materials which have particular electric and magnetic properties.
A part of the energy propagated inside the materials is transformed into heat. We talk about lossy material.

The electromagnetic properties of a material are defined by two parameters: permittivity (ε) which relates to the ability to transmit (or "permit") an electric field and permeability (μ) which is the degree of magnetization of a material that responds linearly to an applied magnetic field.
Permittivity and permeability are complex numbers used to consider material losses.