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dc.contributor.author조윌렴-
dc.date.accessioned2016-08-28T10:08:23Z-
dc.date.available2016-08-28T10:08:23Z-
dc.date.issued2013-
dc.identifier.issn2046-2069-
dc.identifier.otherOAK-9712-
dc.identifier.urihttp://dspace.ewha.ac.kr/handle/2015.oak/223389-
dc.description.abstractRoom-temperature dielectric function ε = ε1 + iε2 spectra of magnetoelectric Ga2-xFe xO3 (x = 0.9, 1.0, and 1.4) thin films are determined by spectroscopic ellipsometry (SE) as a function of Fe concentration x. The SE data are analysed by a multilayer model with a series of Tauc-Lorentz oscillators. While the threshold energies slightly decrease as x increases, the oscillator strength shows a strong composition-dependence for the major optical structure at ∼3.5 eV. The experimental data are compared to the ε spectra obtained by density functional theory (DFT) calculations. Even though the overall shape of ε spectra is consistent, the experimental data and calculated spectra show a clear discrepancy in the oscillator's strength ratio of the two optical structures at ∼3.5 and ∼6.0 eV. The DFT calculations suggest that a significant disordering in the cationic (Ga and Fe) sites in Ga2-xFexO3 is present in thin films, which influences their optical properties. This work demonstrates a successful application of optical characterization for determining the cationic sites occupation in thin films, which in turn improves our understanding of Physics and Chemistry in Ga2-xFexO3 thin films and paves a pathway to the development of new multifunctional devices. © 2013 The Royal Society of Chemistry.-
dc.languageEnglish-
dc.titleEffects of iron concentration and cationic site disorder on the optical properties of magnetoelectric gallium ferrite thin films-
dc.typeArticle-
dc.relation.issue9-
dc.relation.volume3-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.startpage3124-
dc.relation.lastpage3130-
dc.relation.journaltitleRSC Advances-
dc.identifier.doi10.1039/c2ra22681b-
dc.identifier.wosidWOS:000314475700034-
dc.identifier.scopusid2-s2.0-84874402395-
dc.author.googleThomasson A.-
dc.author.googleIbrahim F.-
dc.author.googleLefevre C.-
dc.author.googleAutissier E.-
dc.author.googleRoulland F.-
dc.author.googleMeny C.-
dc.author.googleLeuvrey C.-
dc.author.googleChoi S.-
dc.author.googleJo W.-
dc.author.googleCregut O.-
dc.author.googleVersini G.-
dc.author.googleBarre S.-
dc.author.googleAlouani M.-
dc.author.googleViart N.-
dc.contributor.scopusid조윌렴(7103322276)-
dc.date.modifydate20170522102136-
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자연과학대학 > 물리학전공 > Journal papers
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