Título:	A numerical study on the interplay between the intra-particle and interparticle characteristics in bimagnetic soft/soft and hard/soft ultrasmall nanoparticle assemblies
Autor(es):	Silva, Franciscarlos Gomes da Vasilakaki, Marianna Gomes, Rafael Cabreira Aquino, Renata Campos, Alex Fabiano Cortez Dubois, Emmanuelle Perzynski, Régine Depeyrot, Jérôme Trohidou, Kalliopi
E-mail do autor:	mailto:franciscarlos@fis.unb.br
ORCID:	https://orcid.org/0000-0003-1976-867X https://orcid.org/0000-0003-1832-7549 https://orcid.org/0000-0002-7918-8522 https://orcid.org/0000-0001-8554-8486 https://orcid.org/0000-0002-6634-6245 https://orcid.org/0000-0002-1689-573X https://orcid.org/0000-0002-6921-5419
Assunto:	Bimagnético Nanoestruturas Nanopartículas - propriedades magnéticas
Data de publicação:	4-Ago-2022
Editora:	Royal Society of Chemistry
Referência:	SILVA, Franciscarlos Gomes da et al. A numerical study on the interplay between the intra-particle and interparticle characteristics in bimagnetic soft/soft and hard/soft ultrasmall nanoparticle assemblies. Nanoscale Advances, v. 4, n. 18, p. 3777-3785, 2022. DOI 10.1039/D1NA00894C. Disponível em: https://pubs.rsc.org/en/content/articlelanding/2022/NA/D1NA00894C. Acesso em: 19 set. 2022.
Abstract:	Amesoscopic scale approach and the Monte Carlo (MC)method have been employed to study the exchange bias behaviour of MnFe2O4 (soft)/maghemite (soft) and CoFe2O4 (hard)/maghemite (soft) nanoparticles (NPs) of size ~ 3nm in dense and diluted assemblies at low temperatures. The analysis of our MC results clearly shows that in the powder samples the contribution to the exchange bias field (Hex) and the coercivity (Hc) comes mainly from the intraparticle core/shell structure in the hard/soft sample and that the interplay between the internal characteristics and the interparticle interactions is more important in the soft/soft samples where the dipolar strength is enhanced. In the diluted frozen ferrofluid samples where interparticle exchange interactions are absent and the role of the dipolar interactions is not significant the exchange bias effects are reduced, and they come from the intra particle structure. The variation of Hex and Hc with the applied cooling field well reproduces the experimental findings and sheds light on the key mechanisms of the observed magnetic behaviour. Our results demonstrate the possibility to control the magnetic behaviour of nanostructures by using properly chosen core/shell bimagnetic nanoparticles.
Licença:	Nanoscale Advances - This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. FONTE: https://pubs.rsc.org/en/content/articlelanding/2022/NA/D1NA00894C. Acesso em: 19 set. 2022.
DOI:	https://doi.org/10.1039/D1NA00894C
Aparece nas coleções:	Artigos publicados em periódicos e afins

Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.