Growth and characterization of magnetite-maghemite thin films by the dip coating method

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dc.citation.journalTitleHyperfine Interactions
dc.contributor.authorVelásquez, A.A.
dc.contributor.authorArnedo, A.
dc.contributor.departmentUniversidad EAFIT. Departamento de Ciencias Básicas
dc.contributor.researchgroupElectromagnetismo Aplicado (Gema)spa
dc.date.accessioned2021-03-23T21:39:33Z
dc.date.available2021-03-23T21:39:33Z
dc.date.issued2017-03-07
dc.description.abstractWe present the process of growth and characterization of magnetite-maghemite thin films obtained by the dip coating method. The thin films were deposited on glass substrates, using a ferrofluid of nanostructured magnetite-maghemite particles as precursor solution. During the growth of the films the following parameters were controlled: number of dips of the substrates, dip velocity of the substrates and drying times. The films were characterized by Atomic Force Microscopy, Scanning Elelectron Microscopy, four-point method for resistance measurement, Room Temperature Mössbauer Spectroscopy and Hall effect. Mössbauer measurements showed the presence of a sextet attributed to maghemite (?-Fe2O3) and two doublets attributed to superparamagnetic magnetite (Fe3O4), indicating a distribution of oxidation states of the iron as well as a particle size distribution of the magnetic phases in the films. Atomic force microscopy measurements showed that the films cover quasi uniformly the substrates, existing in them some pores with sub-micron size. Scanning Electron Microscopy measurements showed a uniform structure in the films, with spherical particles with size around 10 nm. Voltage versus current measurements showed an ohmic response of the films for currents between 0 and 100 nA. On the other hand, Hall effect measurements showed a nonlinear response of the Hall voltage with the magnetic flux density applied perpendicular to the plane of the films, however the response is fairly linear for magnetic flux densities between 0.15 and 0.35 T approximately. The results suggest that the films are promising for application as magnetic flux density sensors. © 2017, Springer International Publishing Switzerland.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=6526
dc.identifier.doi10.1007/s10751-017-1397-7
dc.identifier.issn03043843spa
dc.identifier.issn15729540spa
dc.identifier.otherWOS;000397971700001
dc.identifier.otherSCOPUS;2-s2.0-85014939626
dc.identifier.urihttp://hdl.handle.net/10784/27172
dc.language.isoengeng
dc.publisherSPRINGER
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85014939626&doi=10.1007%2fs10751-017-1397-7&partnerID=40&md5=72a496ad3755bb75b959ad59c4c42aff
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0304-3843
dc.sourceHyperfine Interactions
dc.subject.keywordDip coatingeng
dc.subject.keywordFerrofluidseng
dc.subject.keywordMagnetiteeng
dc.subject.keywordMössbauer spectroscopyeng
dc.subject.keywordThin filmseng
dc.titleGrowth and characterization of magnetite-maghemite thin films by the dip coating methodeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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