2024-03-29T04:43:55Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1316722021-12-28T16:21:11Zcom_10261_10252com_10261_3col_10261_10253
2016-05-04T09:20:06Z
urn:hdl:10261/131672
Enhanced magnetic properties in antiferromagnetic-core/ferrimagnetic-shell nanoparticles
Vasilakaki, Marianna
Trohidou, Kalliopi N.
Nogués, Josep
Generalitat de Catalunya
Ministry of Economy, Development and Tourism (Greece)
Ministerio de Economía y Competitividad (España)
European Commission
This work is licensed under a Creative Commons Attribution 4.0 International License.
Bi-magnetic core/shell nanoparticles are gaining increasing interest due to their foreseen applications. Inverse antiferromagnetic(AFM)/ferrimagnetic(FiM) core/shell nanoparticles are particularly appealing since they may overcome some of the limitations of conventional FiM/AFM systems. However, virtually no simulations exist on this type of morphology. Here we present systematic Metropolis Monte Carlo simulations of the exchange bias properties of such nanoparticles. The coercivity, HC, and loop shift, Hex, present a non-monotonic dependence with the core diameter and the shell thickness, in excellent agreement with the available experimental data. Additionally, we demonstrate novel unconventional behavior in FiM/AFM particles. Namely, while HC and Hex decrease upon increasing FiM thickness for small AFM cores (as expected), they show the opposite trend for large cores. This presents a counterintuitive FiM size dependence for large AFM cores that is attributed to the competition between core and shell contributions, which expands over a wider range of core diameters leading to non-vanishing Hex even for very large cores. Moreover, the results also hint different possible ways to enhance the experimental performance of inverse core/shell nanoparticles for diverse applications.
2016-05-04T09:20:06Z
2016-05-04T09:20:06Z
2015
2016-05-04T09:20:07Z
artículo
Scientific Reports 5: 9609 (2015)
http://hdl.handle.net/10261/131672
10.1038/srep09609
http://dx.doi.org/10.13039/501100002809
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100000780
25872473
eng
Publisher's version
http://dx.doi.org/10.1038/srep09609
No
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2013-48628-R
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2013-0295
http://creativecommons.org/licenses/by/4.0/
openAccess
Nature Publishing Group