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Superparamagnetic state in La(0.7)Sr(0.3)MnO(3) thin films obtained by rf-sputtering

A novel superparamagnetic state has been observed in high quality La(0.7)Sr(0.3)MnO(3) (LSMO) thin films directly grown by rf-sputtering on SiO(x)/Si(100) substrates. The films are nanostructured without grain boundaries, constituted by locally epitaxial nanoregions grown layer-by-layer with out-of-...

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Autores principales: Ramírez Camacho, M. C., Sánchez Valdés, C. F., Curiel, M., Sánchez Llamazares, J. L., Siqueiros, J. M., Raymond Herrera, O.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7018749/
https://www.ncbi.nlm.nih.gov/pubmed/32054941
http://dx.doi.org/10.1038/s41598-020-59334-3
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author Ramírez Camacho, M. C.
Sánchez Valdés, C. F.
Curiel, M.
Sánchez Llamazares, J. L.
Siqueiros, J. M.
Raymond Herrera, O.
author_facet Ramírez Camacho, M. C.
Sánchez Valdés, C. F.
Curiel, M.
Sánchez Llamazares, J. L.
Siqueiros, J. M.
Raymond Herrera, O.
author_sort Ramírez Camacho, M. C.
collection PubMed
description A novel superparamagnetic state has been observed in high quality La(0.7)Sr(0.3)MnO(3) (LSMO) thin films directly grown by rf-sputtering on SiO(x)/Si(100) substrates. The films are nanostructured without grain boundaries, constituted by locally epitaxial nanoregions grown layer-by-layer with out-of-plane (012) preferential orientation, induced by the constrain of the native silicon oxide. Low magnetic field ZFC-FC magnetization curves show a cross-over from superparamagnetic to ferromagnetic state dependent of the thickness. The thicker film (140 nm) exhibits typical ferromagnetic order. The thinner films (40 and 60 nm) exhibit superparamagnetic behavior attributed to interacting ferromagnetic monodomain nanoregions with critical size, random in-plane oriented, where the inter-monodomain boundaries with surface spin-glass structure regulate the blocking of magnetization depending on the magnetic field intensity. M(H) hysteresis loops showed noticeable coercive fields in all samples, larger than those reported for LSMO. Such properties of half-metal LSMO film foresee potential integration in new Si-technology nanodevices in Spintronics.
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spelling pubmed-70187492020-02-21 Superparamagnetic state in La(0.7)Sr(0.3)MnO(3) thin films obtained by rf-sputtering Ramírez Camacho, M. C. Sánchez Valdés, C. F. Curiel, M. Sánchez Llamazares, J. L. Siqueiros, J. M. Raymond Herrera, O. Sci Rep Article A novel superparamagnetic state has been observed in high quality La(0.7)Sr(0.3)MnO(3) (LSMO) thin films directly grown by rf-sputtering on SiO(x)/Si(100) substrates. The films are nanostructured without grain boundaries, constituted by locally epitaxial nanoregions grown layer-by-layer with out-of-plane (012) preferential orientation, induced by the constrain of the native silicon oxide. Low magnetic field ZFC-FC magnetization curves show a cross-over from superparamagnetic to ferromagnetic state dependent of the thickness. The thicker film (140 nm) exhibits typical ferromagnetic order. The thinner films (40 and 60 nm) exhibit superparamagnetic behavior attributed to interacting ferromagnetic monodomain nanoregions with critical size, random in-plane oriented, where the inter-monodomain boundaries with surface spin-glass structure regulate the blocking of magnetization depending on the magnetic field intensity. M(H) hysteresis loops showed noticeable coercive fields in all samples, larger than those reported for LSMO. Such properties of half-metal LSMO film foresee potential integration in new Si-technology nanodevices in Spintronics. Nature Publishing Group UK 2020-02-13 /pmc/articles/PMC7018749/ /pubmed/32054941 http://dx.doi.org/10.1038/s41598-020-59334-3 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ramírez Camacho, M. C.
Sánchez Valdés, C. F.
Curiel, M.
Sánchez Llamazares, J. L.
Siqueiros, J. M.
Raymond Herrera, O.
Superparamagnetic state in La(0.7)Sr(0.3)MnO(3) thin films obtained by rf-sputtering
title Superparamagnetic state in La(0.7)Sr(0.3)MnO(3) thin films obtained by rf-sputtering
title_full Superparamagnetic state in La(0.7)Sr(0.3)MnO(3) thin films obtained by rf-sputtering
title_fullStr Superparamagnetic state in La(0.7)Sr(0.3)MnO(3) thin films obtained by rf-sputtering
title_full_unstemmed Superparamagnetic state in La(0.7)Sr(0.3)MnO(3) thin films obtained by rf-sputtering
title_short Superparamagnetic state in La(0.7)Sr(0.3)MnO(3) thin films obtained by rf-sputtering
title_sort superparamagnetic state in la(0.7)sr(0.3)mno(3) thin films obtained by rf-sputtering
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7018749/
https://www.ncbi.nlm.nih.gov/pubmed/32054941
http://dx.doi.org/10.1038/s41598-020-59334-3
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