Synthesis and magnetic characterization of co-axial Ge1-xMnx/a-Si heterostructures

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dc.contributor.authorBarth, Sven
dc.contributor.authorKazakova, Olga
dc.contributor.authorEstrade, Sonia
dc.contributor.authorHobbes, Richard G.
dc.contributor.authorPiero, Francesca
dc.contributor.authorMorris, Michael A.
dc.contributor.authorHolmes, Justin D.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderIrish Research Council for Science, Engineering and Technologyen
dc.contributor.funderSeventh Framework Programmeen
dc.contributor.funderHigher Education Authorityen
dc.contributor.funderMinisterio de Economía, Industria y Competitividad, Gobierno de Españaen
dc.contributor.funderUniversitat de Barcelonaen
dc.date.accessioned2018-09-12T15:07:20Z
dc.date.available2018-09-12T15:07:20Z
dc.date.issued2011-10-08
dc.date.updated2018-08-06T14:41:09Z
dc.description.abstractA method for synthesizing Ge1–xMnx/a-Si core–shell nanowires (x = 0.3(1)–1.0(2)) using a supercritical fluid deposition technique, with a homogeneous distribution of manganese along the entire lengths of the crystalline Ge cores but not in the a-Si shells, is reported. Investigations into the magnetic properties of the heterostructured nanowires revealed a significant influence of the amorphous Si shell covering the surface of the core Ge0.997Mn0.003 nanowires compared to pristine Ge0.997Mn0.003 nanowires with no a-Si coating. The magnetic data revealed diminished values of both the remanence and the saturation magnetization for pristine Mn-doped Ge nanowires at higher temperatures when compared to the Ge1–xMnx/a-Si core–shell nanowires, whereas both parameters increased as the temperature dropped down to 5 K. Differences in the temperature-dependent evolution of the coercivity were observed in the magnetically harder core–shell nanowires compared to the pristine Ge0.997Mn0.003 nanowires, showing a drop of 26% at 5 K vs room temperature compared to a drop of 66% for the pristine nanowires. The low dopant concentration (0.3(1)%) of Mn in the core–shell nanowires, combined with the observed ferromagnetic properties, suggests a combination of hole-mediated exchange and confinement processes are responsible for the observed properties. Our observations show the importance of a protective layer in covering the oxidation-sensitive dilute magnetic semiconductor nanowires.en
dc.description.sponsorshipHigher Education Authority (HEA Program for Research in Third Level Institutions (2007-2011) via the INSPIRE programme); Ministerio de Economía, Industria y Competitividad, Gobierno de España (Spanish Government (IMAGINE-Consolider, SOLEMN, and MAT2010-20616-C02 projects); Universitat de Barcelona (TEM facilities of Science and Technical Centers of the Universitat de Barcelona (CCiT-UB).en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationBarth, S., Kazakova, O., Estrade, S., Hobbs, R. G., Peiro, F., Morris, M. A. and Holmes, J. D. (2011) 'Synthesis and Magnetic Characterization of Coaxial Ge1–xMnx/a-Si Heterostructures', Crystal Growth & Design, 11(12), pp. 5253-5259.en
dc.identifier.doi10.1021/cg200667r
dc.identifier.endpage5259en
dc.identifier.issn1528-7483
dc.identifier.journaltitleCrystal Growth and Designen
dc.identifier.startpage5253en
dc.identifier.urihttps://hdl.handle.net/10468/6763
dc.identifier.volume11en
dc.language.isoenen
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Frontiers Programme (RFP)/07/RFP/MASF710/IE/Nanocable Arrays for Future Electronics/en
dc.relation.projectinfo:eu-repo/grantAgreement/RCUK/EPSRC/EP/R011753/1/GB/Chemical control of function beyond the unit cell for new electroceramic materials/en
dc.relation.urihttps://pubs.acs.org/doi/abs/10.1021/cg200667r
dc.rights© 2011 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Crystal Growth & Design copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/cg200667ren
dc.subjectGermaniumen
dc.subjectNanowireen
dc.subjectHeterostructureen
dc.subjectCore-shellen
dc.subjectMagnetic propertiesen
dc.subjectStructural characterizationen
dc.titleSynthesis and magnetic characterization of co-axial Ge1-xMnx/a-Si heterostructuresen
dc.typeArticle (peer-reviewed)en
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