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

Show simple item record Barth, Sven Kazakova, Olga Estrade, Sonia Hobbes, Richard G. Piero, Francesca Morris, Michael A. Holmes, Justin D. 2018-09-12T15:07:20Z 2018-09-12T15:07:20Z 2011-10-08
dc.identifier.citation Barth, 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.volume 11 en
dc.identifier.startpage 5253 en
dc.identifier.endpage 5259 en
dc.identifier.issn 1528-7483
dc.identifier.doi 10.1021/cg200667r
dc.description.abstract A 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.sponsorship Higher 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.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Chemical Society (ACS) en
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 en
dc.subject Germanium en
dc.subject Nanowire en
dc.subject Heterostructure en
dc.subject Core-shell en
dc.subject Magnetic properties en
dc.subject Structural characterization en
dc.title Synthesis and magnetic characterization of co-axial Ge1-xMnx/a-Si heterostructures en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Justin D. Holmes, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: en
dc.internal.availability Full text available en 2018-08-06T14:41:09Z
dc.description.version Accepted Version en
dc.internal.rssid 117321829
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Irish Research Council for Science, Engineering and Technology en
dc.contributor.funder Seventh Framework Programme en
dc.contributor.funder Higher Education Authority en
dc.contributor.funder Ministerio de Economía, Industria y Competitividad, Gobierno de España en
dc.contributor.funder Universitat de Barcelona en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Crystal Growth and Design en
dc.internal.copyrightchecked No !!CORA!! en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Research Frontiers Programme (RFP)/07/RFP/MASF710/IE/Nanocable Arrays for Future Electronics/ en
dc.relation.project info:eu-repo/grantAgreement/RCUK/EPSRC/EP/R011753/1/GB/Chemical control of function beyond the unit cell for new electroceramic materials/ en

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