Memory and superposition in a superspin glass

Abstract The non-equilibrium dynamics of the superspin glass state of a dense assembly of ~ 2 nm MnFe2O4 nanoparticles was investigated by means of magnetization, ac susceptibility and Mössbauer spectroscopy measurements and compared to the results of Monte Carlo simulations for a mesoscopic model t...

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Autores principales:	D. Peddis, K. N. Trohidou, M. Vasilakaki, G. Margaris, M. Bellusci, F. Varsano, M. Hudl, N. Yaacoub, D. Fiorani, P. Nordblad, R. Mathieu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e690c009d46d466d9b00bc7620062366
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spelling	oai:doaj.org-article:e690c009d46d466d9b00bc76200623662021-12-02T14:26:07ZMemory and superposition in a superspin glass10.1038/s41598-021-87345-12045-2322https://doaj.org/article/e690c009d46d466d9b00bc76200623662021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87345-1https://doaj.org/toc/2045-2322Abstract The non-equilibrium dynamics of the superspin glass state of a dense assembly of ~ 2 nm MnFe2O4 nanoparticles was investigated by means of magnetization, ac susceptibility and Mössbauer spectroscopy measurements and compared to the results of Monte Carlo simulations for a mesoscopic model that includes particles morphology and interparticle interactions. The zero-field cooled (ZFC), thermoremanent (TRM), and isothermal remanent magnetization (IRM) were recorded after specific cooling protocols and compared to those of archetypal spin glasses and their dimensionality. The system is found to display glassy magnetic features. We illustrate in detail, by a number of experiments, the dynamical properties of the low-temperature superspin glass phase. We observe that these glassy features are quite similar to those of atomic spin glasses. Some differences are observed, and interestingly, the non-atomic nature of the superspin glass is also reflected by an observed superspin dimensionality crossover. Monte Carlo simulations—that explicitly take into account core and surface contributions to the magnetic properties of these ultrasmall nanoparticles in direct contact, as well as interparticle interactions—evidence effects of the interplay between (intraparticle) core/surface exchange coupling and (interparticle) dipolar and exchange interactions.D. PeddisK. N. TrohidouM. VasilakakiG. MargarisM. BellusciF. VarsanoM. HudlN. YaacoubD. FioraniP. NordbladR. MathieuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q D. Peddis K. N. Trohidou M. Vasilakaki G. Margaris M. Bellusci F. Varsano M. Hudl N. Yaacoub D. Fiorani P. Nordblad R. Mathieu Memory and superposition in a superspin glass
description	Abstract The non-equilibrium dynamics of the superspin glass state of a dense assembly of ~ 2 nm MnFe2O4 nanoparticles was investigated by means of magnetization, ac susceptibility and Mössbauer spectroscopy measurements and compared to the results of Monte Carlo simulations for a mesoscopic model that includes particles morphology and interparticle interactions. The zero-field cooled (ZFC), thermoremanent (TRM), and isothermal remanent magnetization (IRM) were recorded after specific cooling protocols and compared to those of archetypal spin glasses and their dimensionality. The system is found to display glassy magnetic features. We illustrate in detail, by a number of experiments, the dynamical properties of the low-temperature superspin glass phase. We observe that these glassy features are quite similar to those of atomic spin glasses. Some differences are observed, and interestingly, the non-atomic nature of the superspin glass is also reflected by an observed superspin dimensionality crossover. Monte Carlo simulations—that explicitly take into account core and surface contributions to the magnetic properties of these ultrasmall nanoparticles in direct contact, as well as interparticle interactions—evidence effects of the interplay between (intraparticle) core/surface exchange coupling and (interparticle) dipolar and exchange interactions.
format	article
author	D. Peddis K. N. Trohidou M. Vasilakaki G. Margaris M. Bellusci F. Varsano M. Hudl N. Yaacoub D. Fiorani P. Nordblad R. Mathieu
author_facet	D. Peddis K. N. Trohidou M. Vasilakaki G. Margaris M. Bellusci F. Varsano M. Hudl N. Yaacoub D. Fiorani P. Nordblad R. Mathieu
author_sort	D. Peddis
title	Memory and superposition in a superspin glass
title_short	Memory and superposition in a superspin glass
title_full	Memory and superposition in a superspin glass
title_fullStr	Memory and superposition in a superspin glass
title_full_unstemmed	Memory and superposition in a superspin glass
title_sort	memory and superposition in a superspin glass
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e690c009d46d466d9b00bc7620062366
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Memory and superposition in a superspin glass

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