Grain boundary anisotropy on nano-polycrystalline magnetic thin films

Abstract Grain boundaries in polycrystalline thin films with crystallite sizes at nanoscale presents regions characterized by a high degree of local structural disorder. As a consequence, great values of the associated local anisotropies are expected. On this regard, a systematic investigation of th...

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Autores principales:	Jose D. Agudelo-Giraldo, Elisabeth Restrepo-Parra, Johans Restrepo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/21f00fdc128742aca6df5ed90d055f54
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spelling	oai:doaj.org-article:21f00fdc128742aca6df5ed90d055f542021-12-02T17:05:01ZGrain boundary anisotropy on nano-polycrystalline magnetic thin films10.1038/s41598-020-61979-z2045-2322https://doaj.org/article/21f00fdc128742aca6df5ed90d055f542020-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-61979-zhttps://doaj.org/toc/2045-2322Abstract Grain boundaries in polycrystalline thin films with crystallite sizes at nanoscale presents regions characterized by a high degree of local structural disorder. As a consequence, great values of the associated local anisotropies are expected. On this regard, a systematic investigation of the effect of the grain boundary anisotropy on the magnetic properties in such type of nanostructured systems is addressed. For developing this work, a standard Monte Carlo simulation in the framework of classical Heisenberg spins was carried out, with a Hamiltonian involving exchange couplings, dipolar interactions, Zeeman interaction and contributions of cubic magneto-crystalline anisotropy. A quantification of local structural disorder was considered. Results revealed that i) by keeping the same number of grains, different organizations give rise to different spontaneous magnetizations, ii) the critical exponent of the magnetization differs of pure models, which is attributed to the complexity of the lattice and consistent with a distribution of critical temperatures, iii) Boundary anisotropy varies with temperature and its strength are determinant factors for blocking temperatures, and iv) Boundary anisotropy inside in the hysteretic properties where coercive field variations are observed.Jose D. Agudelo-GiraldoElisabeth Restrepo-ParraJohans RestrepoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-11 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jose D. Agudelo-Giraldo Elisabeth Restrepo-Parra Johans Restrepo Grain boundary anisotropy on nano-polycrystalline magnetic thin films
description	Abstract Grain boundaries in polycrystalline thin films with crystallite sizes at nanoscale presents regions characterized by a high degree of local structural disorder. As a consequence, great values of the associated local anisotropies are expected. On this regard, a systematic investigation of the effect of the grain boundary anisotropy on the magnetic properties in such type of nanostructured systems is addressed. For developing this work, a standard Monte Carlo simulation in the framework of classical Heisenberg spins was carried out, with a Hamiltonian involving exchange couplings, dipolar interactions, Zeeman interaction and contributions of cubic magneto-crystalline anisotropy. A quantification of local structural disorder was considered. Results revealed that i) by keeping the same number of grains, different organizations give rise to different spontaneous magnetizations, ii) the critical exponent of the magnetization differs of pure models, which is attributed to the complexity of the lattice and consistent with a distribution of critical temperatures, iii) Boundary anisotropy varies with temperature and its strength are determinant factors for blocking temperatures, and iv) Boundary anisotropy inside in the hysteretic properties where coercive field variations are observed.
format	article
author	Jose D. Agudelo-Giraldo Elisabeth Restrepo-Parra Johans Restrepo
author_facet	Jose D. Agudelo-Giraldo Elisabeth Restrepo-Parra Johans Restrepo
author_sort	Jose D. Agudelo-Giraldo
title	Grain boundary anisotropy on nano-polycrystalline magnetic thin films
title_short	Grain boundary anisotropy on nano-polycrystalline magnetic thin films
title_full	Grain boundary anisotropy on nano-polycrystalline magnetic thin films
title_fullStr	Grain boundary anisotropy on nano-polycrystalline magnetic thin films
title_full_unstemmed	Grain boundary anisotropy on nano-polycrystalline magnetic thin films
title_sort	grain boundary anisotropy on nano-polycrystalline magnetic thin films
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/21f00fdc128742aca6df5ed90d055f54
work_keys_str_mv	AT josedagudelogiraldo grainboundaryanisotropyonnanopolycrystallinemagneticthinfilms AT elisabethrestrepoparra grainboundaryanisotropyonnanopolycrystallinemagneticthinfilms AT johansrestrepo grainboundaryanisotropyonnanopolycrystallinemagneticthinfilms
_version_	1718381778272518144

Grain boundary anisotropy on nano-polycrystalline magnetic thin films

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