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:
https://lup.lub.lu.se/record/1160865
- author
- Ramprecht, Jörgen
and Sjöberg, Daniel
LU
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physics D: Applied Physics
- volume
- 41
- issue
- 13
- article number
- 135005
- 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
- 2016-04-01 14:06:46
- date last changed
- 2022-01-27 22:50:14
@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.}},
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}},
doi = {{10.1088/0022-3727/41/13/135005}},
volume = {{41}},
year = {{2008}},
}