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Magnetic losses in composite materials

Ramprecht, Jörgen and Sjöberg, Daniel LU (2008) In Journal of Physics D: Applied Physics 41(13).
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 behaviour 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... (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 behaviour 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
Contribution to journal
publication status
published
subject
in
Journal of Physics D: Applied Physics
volume
41
issue
13
publisher
IOP Publishing
external identifiers
  • wos:000256928100037
  • scopus:48249129687
ISSN
1361-6463
DOI
10.1088/0022-3727/41/13/135005
language
English
LU publication?
yes
id
a89e5415-58aa-47ce-aca3-2c1b63fc3245 (old id 1160865)
date added to LUP
2008-06-17 09:47:57
date last changed
2017-05-21 04:02:49
@article{a89e5415-58aa-47ce-aca3-2c1b63fc3245,
  abstract     = {We discuss some of the problems involved in homogenization of a composite material built<br/><br>
from ferromagnetic inclusions in a nonmagnetic background material. The small signal<br/><br>
permeability for a ferromagnetic spherical particle is combined with a homogenization<br/><br>
formula to give an effective permeability for the composite material. The composite material<br/><br>
inherits the gyrotropic structure and resonant behaviour of the single particle. The resonance<br/><br>
frequency of the composite material is found to be independent of the volume fraction, unlike<br/><br>
dielectric composite materials. The magnetic losses are described by a magnetic conductivity<br/><br>
which can be made independent of frequency and proportional to the volume fraction by<br/><br>
choosing a certain bias. Finally, some concerns regarding particles of small size, i.e.<br/><br>
nanoparticles, are treated and the possibility of exciting exchange modes are discussed.<br/><br>
These exchange modes may be an interesting way to increase losses in composite materials.},
  articleno    = {135005},
  author       = {Ramprecht, Jörgen and Sjöberg, Daniel},
  issn         = {1361-6463},
  language     = {eng},
  number       = {13},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics D: Applied Physics},
  title        = {Magnetic losses in composite materials},
  url          = {http://dx.doi.org/10.1088/0022-3727/41/13/135005},
  volume       = {41},
  year         = {2008},
}