Advanced

Magnetic losses in composite materials

Ramprecht, Jörgen and Sjöberg, Daniel LU (2008) In Technical Report LUTEDX/(TEAT-7169)/1-28/(2008) TEAT-7169.
Abstract
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.... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Book/Report
publication status
published
subject
in
Technical Report LUTEDX/(TEAT-7169)/1-28/(2008)
volume
TEAT-7169
pages
28 pages
publisher
[Publisher information missing]
external identifiers
  • Scopus:48249129687
language
English
LU publication?
yes
id
028bbaf8-5b30-4566-8e8c-4c8d817f2223 (old id 1049915)
date added to LUP
2008-03-25 10:55:55
date last changed
2016-12-04 04:48:33
@misc{028bbaf8-5b30-4566-8e8c-4c8d817f2223,
  abstract     = {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.},
  author       = {Ramprecht, Jörgen and Sjöberg, Daniel},
  language     = {eng},
  pages        = {28},
  publisher    = {ARRAY(0x7ad7760)},
  series       = {Technical Report LUTEDX/(TEAT-7169)/1-28/(2008)},
  title        = {Magnetic losses in composite materials},
  volume       = {TEAT-7169},
  year         = {2008},
}