This tutorial aims at revisiting the very basic concept of the measurement of magnetic behavior and magnetic permeability, as well as at providing a discussion towards possible novel magnetic materials, even with very unusual arbitrary B-H relationships. Starting from the spatial averaging of unobservable microscopic fields and the identification of the observable macroscopic fields as introduced by Lorentz, the measurement of the magnetic permeability in composite materials is discussed from its basic definition. Particular composite resonator structures are considered and it is shown how they can exhibit even negative magnetic permeability values even at industrial frequencies.
Keywords: magnetism, composite, materials, IEEE, IMS, Bernardo Tellini, measurement, tutorials, education
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