Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems
Name
Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems.pdf
Description
Published version
Size
1.55 MB
Format
Adobe PDF
Checksum (MD5)
34ac6c5c8521dee5a3553c338791a024
Author(s)
Fabris, F
Tu, Kun-Hua
Ross, CA
Nunes, WC
Date Issued
2019
Journal
Journal of Applied Physics
Publisher
AIP Publishing
Version
Final published version
Abstract
© 2019 Author(s). Magnetic effects caused by dipolar interactions in single-domain magnetic ensembles at finite temperatures are described. A modified superparamagnetic approach based on the mean field theory and random anisotropy model has been developed to describe the magnetization curves of nanoparticle assemblies. The model was used to fit experimental zero-field-cooled and field-cooled magnetization curves in Fe 3O 4 nanoparticles embedded in paraffin. The fitting parameters were based on structural properties of the materials and the strength of the interactions between nanoparticles. The model provides a quantitative description of the effects of the nanoparticle interaction with good agreement with the experiment. In addition, the model was adapted to describe magnetic properties of a NiFe thin film patterned into a nanodot array, showing potential to be used as a framework to predict magnetic interaction effects in high-density 2D arrays such as bit patterned media.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/1.5125595
