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Magnetic losses in composite materials

In English

Författare

Summary, in English

We discuss some of the problems involved in homogenization of a composite material built from ferromagnetic inclusions in a nonmagnetic background material. The small signal permeability for a ferromagnetic spherical particle is combined with a homogenization formula to give an effective permeability for the composite material. The composite material inherits the gyrotropic structure and resonant behavior of the single particle. The resonance frequency of the composite material is found to be independent of the volume fraction, unlike dielectric composite materials. The magnetic losses are described by a magnetic conductivity which can be made independent of frequency and proportional to the volume fraction by choosing a certain bias. Finally, some concerns regarding particles of small size, i.e., nanoparticles, are treated and the possibility of exciting exchange modes are discussed. These exchange modes may be an interesting way to increase losses in composite materials.

Publiceringsår

2008

Språk

Engelska

Publikation/Tidskrift/Serie

Technical Report LUTEDX/(TEAT-7169)/1-28/(2008)

Dokumenttyp

Rapport

Förlag

[Publisher information missing]

Ämne

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

Report number

TEAT-7169

Forskningsgrupp

  • Electromagnetic theory