Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems
© 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 nano...
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing
2021
|
| Online Access: | https://hdl.handle.net/1721.1/136526 |
| _version_ | 1826217143028416512 |
|---|---|
| author | Fabris, F Tu, Kun-Hua Ross, CA Nunes, WC |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Fabris, F Tu, Kun-Hua Ross, CA Nunes, WC |
| author_sort | Fabris, F |
| collection | MIT |
| description | © 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. |
| first_indexed | 2024-09-23T16:58:42Z |
| format | Article |
| id | mit-1721.1/136526 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:58:42Z |
| publishDate | 2021 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1365262023-01-11T18:59:08Z Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems Fabris, F Tu, Kun-Hua Ross, CA Nunes, WC Massachusetts Institute of Technology. Department of Materials Science and Engineering © 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. 2021-10-27T20:35:47Z 2021-10-27T20:35:47Z 2019 2020-09-10T17:42:25Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136526 en 10.1063/1.5125595 Journal of Applied Physics 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. application/pdf AIP Publishing MIT web domain |
| spellingShingle | Fabris, F Tu, Kun-Hua Ross, CA Nunes, WC Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems |
| title | Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems |
| title_full | Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems |
| title_fullStr | Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems |
| title_full_unstemmed | Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems |
| title_short | Influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems |
| title_sort | influence of dipolar interactions on the magnetic properties of superparamagnetic particle systems |
| url | https://hdl.handle.net/1721.1/136526 |
| work_keys_str_mv | AT fabrisf influenceofdipolarinteractionsonthemagneticpropertiesofsuperparamagneticparticlesystems AT tukunhua influenceofdipolarinteractionsonthemagneticpropertiesofsuperparamagneticparticlesystems AT rossca influenceofdipolarinteractionsonthemagneticpropertiesofsuperparamagneticparticlesystems AT nuneswc influenceofdipolarinteractionsonthemagneticpropertiesofsuperparamagneticparticlesystems |