This paper focuses on the measurement of the effective magnetic permeability μeff in composite structures built from nonmagnetic materials. Starting from recent studies of magnetism in microstructures, we present the results of a new theoretical and experimental analysis performed at frequencies below the medium frequencies. Mainly, we focus on how “spatial averaging” can affect the estimation of the parameter μeff and show how expressions of μeff derived for a single “unit-cell” configuration find analogy with that relevant to composite structured arrays. Finally, we show how to obtain negative values of μeff for composite materials in the industrial frequency range and make some remarks on how future technologies can impact on the measurement of magnetism in composite materials.
Measurement of Magnetism in Composite Materials
TELLINI, BERNARDO;
2009-01-01
Abstract
This paper focuses on the measurement of the effective magnetic permeability μeff in composite structures built from nonmagnetic materials. Starting from recent studies of magnetism in microstructures, we present the results of a new theoretical and experimental analysis performed at frequencies below the medium frequencies. Mainly, we focus on how “spatial averaging” can affect the estimation of the parameter μeff and show how expressions of μeff derived for a single “unit-cell” configuration find analogy with that relevant to composite structured arrays. Finally, we show how to obtain negative values of μeff for composite materials in the industrial frequency range and make some remarks on how future technologies can impact on the measurement of magnetism in composite materials.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
