Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles

Abstract Magnetic nanoparticles (MNPs) have become increasingly important in biomedical applications like magnetic imaging and hyperthermia based cancer treatment. Understanding their magnetic spin configurations is important for optimizing these applications. The measured magnetization of MNPs can...

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Autores principales:	Samuel D. Oberdick, Ahmed Abdelgawad, Carlos Moya, Samaneh Mesbahi-Vasey, Demie Kepaptsoglou, Vlado K. Lazarov, Richard F. L. Evans, Daniel Meilak, Elizabeth Skoropata, Johan van Lierop, Ian Hunt-Isaak, Hillary Pan, Yumi Ijiri, Kathryn L. Krycka, Julie A. Borchers, Sara A. Majetich
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/676084dde33b4ce08c1c82e7059af7c3
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spelling	oai:doaj.org-article:676084dde33b4ce08c1c82e7059af7c32021-12-02T15:08:54ZSpin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles10.1038/s41598-018-21626-02045-2322https://doaj.org/article/676084dde33b4ce08c1c82e7059af7c32018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-21626-0https://doaj.org/toc/2045-2322Abstract Magnetic nanoparticles (MNPs) have become increasingly important in biomedical applications like magnetic imaging and hyperthermia based cancer treatment. Understanding their magnetic spin configurations is important for optimizing these applications. The measured magnetization of MNPs can be significantly lower than bulk counterparts, often due to canted spins. This has previously been presumed to be a surface effect, where reduced exchange allows spins closest to the nanoparticle surface to deviate locally from collinear structures. We demonstrate that intraparticle effects can induce spin canting throughout a MNP via the Dzyaloshinskii-Moriya interaction (DMI). We study ~7.4 nm diameter, core/shell Fe3O4/MnxFe3−xO4 MNPs with a 0.5 nm Mn-ferrite shell. Mössbauer spectroscopy, x-ray absorption spectroscopy and x-ray magnetic circular dichroism are used to determine chemical structure of core and shell. Polarized small angle neutron scattering shows parallel and perpendicular magnetic correlations, suggesting multiparticle coherent spin canting in an applied field. Atomistic simulations reveal the underlying mechanism of the observed spin canting. These show that strong DMI can lead to magnetic frustration within the shell and cause canting of the net particle moment. These results illuminate how core/shell nanoparticle systems can be engineered for spin canting across the whole of the particle, rather than solely at the surface.Samuel D. OberdickAhmed AbdelgawadCarlos MoyaSamaneh Mesbahi-VaseyDemie KepaptsoglouVlado K. LazarovRichard F. L. EvansDaniel MeilakElizabeth SkoropataJohan van LieropIan Hunt-IsaakHillary PanYumi IjiriKathryn L. KryckaJulie A. BorchersSara A. MajetichNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-12 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Samuel D. Oberdick Ahmed Abdelgawad Carlos Moya Samaneh Mesbahi-Vasey Demie Kepaptsoglou Vlado K. Lazarov Richard F. L. Evans Daniel Meilak Elizabeth Skoropata Johan van Lierop Ian Hunt-Isaak Hillary Pan Yumi Ijiri Kathryn L. Krycka Julie A. Borchers Sara A. Majetich Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles
description	Abstract Magnetic nanoparticles (MNPs) have become increasingly important in biomedical applications like magnetic imaging and hyperthermia based cancer treatment. Understanding their magnetic spin configurations is important for optimizing these applications. The measured magnetization of MNPs can be significantly lower than bulk counterparts, often due to canted spins. This has previously been presumed to be a surface effect, where reduced exchange allows spins closest to the nanoparticle surface to deviate locally from collinear structures. We demonstrate that intraparticle effects can induce spin canting throughout a MNP via the Dzyaloshinskii-Moriya interaction (DMI). We study ~7.4 nm diameter, core/shell Fe3O4/MnxFe3−xO4 MNPs with a 0.5 nm Mn-ferrite shell. Mössbauer spectroscopy, x-ray absorption spectroscopy and x-ray magnetic circular dichroism are used to determine chemical structure of core and shell. Polarized small angle neutron scattering shows parallel and perpendicular magnetic correlations, suggesting multiparticle coherent spin canting in an applied field. Atomistic simulations reveal the underlying mechanism of the observed spin canting. These show that strong DMI can lead to magnetic frustration within the shell and cause canting of the net particle moment. These results illuminate how core/shell nanoparticle systems can be engineered for spin canting across the whole of the particle, rather than solely at the surface.
format	article
author	Samuel D. Oberdick Ahmed Abdelgawad Carlos Moya Samaneh Mesbahi-Vasey Demie Kepaptsoglou Vlado K. Lazarov Richard F. L. Evans Daniel Meilak Elizabeth Skoropata Johan van Lierop Ian Hunt-Isaak Hillary Pan Yumi Ijiri Kathryn L. Krycka Julie A. Borchers Sara A. Majetich
author_facet	Samuel D. Oberdick Ahmed Abdelgawad Carlos Moya Samaneh Mesbahi-Vasey Demie Kepaptsoglou Vlado K. Lazarov Richard F. L. Evans Daniel Meilak Elizabeth Skoropata Johan van Lierop Ian Hunt-Isaak Hillary Pan Yumi Ijiri Kathryn L. Krycka Julie A. Borchers Sara A. Majetich
author_sort	Samuel D. Oberdick
title	Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles
title_short	Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles
title_full	Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles
title_fullStr	Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles
title_full_unstemmed	Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles
title_sort	spin canting across core/shell fe3o4/mnxfe3−xo4 nanoparticles
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/676084dde33b4ce08c1c82e7059af7c3
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Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles

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