Stoichiometry and Orientation- And Shape-Mediated Switching Field Enhancement of the Heating Properties of Fe3 O4 Circular Nanodiscs

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dc.contributor.authorNiraula, Gopal
dc.contributor.authorCoaquira, Jose A. H.
dc.contributor.authorAragon, Fermin H.
dc.contributor.authorBakuzis, Andris F.
dc.contributor.authorVillar, Bianca M. G.
dc.contributor.authorGarcia, Flavio
dc.contributor.authorMuraca, Diego
dc.contributor.authorZoppellaro, Giorgio
dc.contributor.authorAyesh, Ahmad I.
dc.contributor.authorSharma, Surender K.
dc.date.accessioned2024-01-21T10:42:27Z
dc.date.accessioned2024-08-13T12:44:29Z
dc.date.available2024-01-21T10:42:27Z
dc.date.available2024-08-13T12:44:29Z
dc.date.issued2021-01-28T00:00:00
dc.description.abstractThe generation of topological magnetic vortex-domain structures in iron-oxide nanomaterials has promising applications in biomedical scenarios, such as heat generators for hyperthermia treatments. In this report we describe alternative kinds of magnetic-vortex nanoparticles, circular Fe3O4 nanodiscs (NDs), and dissect their heating properties by in-depth investigation of their shape and size, stoichiometry, orientations, and switching field "HS"behaviors, through experiments and theoretical simulation. We find that the stoichiometric NDs show better heating performance than nonstoichiometric materials because of the significant electron hopping between Fe3+ and Fe2+ ion. The higher heating efficiency (in terms of specific absorption rate, SAR) is observed only for the higher switching field regime, an effect that is associated with the parallel and perpendicular alignment of nanodiscs with respect to low and high ac magnetic field, respectively. A higher SAR of approximately 270 W/g is observed at a higher switching field (approximately 700 Oe) for NDs of diameter 770 nm, which increases by a factor of 4 at a switching field of approximately 360 Oe for NDs of diameter 200 nm. The reported results suggest that the heating efficiency in these systems can be enhanced by controlling the switching field, which is, in turn, tuned by size, shape, and orientation of circular magnetic vortex nanodiscs. � 2021 American Physical Society.en_US
dc.identifier.doi10.1103/PhysRevApplied.15.014056
dc.identifier.issn23317019
dc.identifier.urihttp://10.2.3.109/handle/32116/3640
dc.identifier.urlhttps://link.aps.org/doi/10.1103/PhysRevApplied.15.014056
dc.language.isoen_USen_US
dc.publisherAmerican Physical Societyen_US
dc.subjectEfficiencyen_US
dc.subjectHeatingen_US
dc.subjectHydraulic structuresen_US
dc.subjectIron oxidesen_US
dc.subjectMagnetic nanoparticlesen_US
dc.subjectMagnetismen_US
dc.subjectMagnetiteen_US
dc.subjectStoichiometryen_US
dc.subjectVortex flowen_US
dc.subjectHeating efficienciesen_US
dc.subjectHeating performanceen_US
dc.subjectHyperthermia treatmentsen_US
dc.subjectIron oxide nanomaterialsen_US
dc.subjectMagnetic vortex domainen_US
dc.subjectNon-stoichiometric materialsen_US
dc.subjectSpecific absorption rateen_US
dc.subjectTheoretical simulationen_US
dc.subjectSwitchingen_US
dc.titleStoichiometry and Orientation- And Shape-Mediated Switching Field Enhancement of the Heating Properties of Fe3 O4 Circular Nanodiscsen_US
dc.title.journalPhysical Review Applieden_US
dc.typeArticleen_US
dc.type.accesstypeClosed Accessen_US

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