dc.contributor.author |
Barth, Sven |
|
dc.contributor.author |
Kazakova, Olga |
|
dc.contributor.author |
Estrade, Sonia |
|
dc.contributor.author |
Hobbes, Richard G. |
|
dc.contributor.author |
Piero, Francesca |
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dc.contributor.author |
Morris, Michael A. |
|
dc.contributor.author |
Holmes, Justin D. |
|
dc.date.accessioned |
2018-09-12T15:07:20Z |
|
dc.date.available |
2018-09-12T15:07:20Z |
|
dc.date.issued |
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 |
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dc.identifier.uri |
http://hdl.handle.net/10468/6763 |
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dc.identifier.doi |
10.1021/cg200667r |
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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. |
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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). |
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dc.format.mimetype |
application/pdf |
en |
dc.language.iso |
en |
en |
dc.publisher |
American Chemical Society (ACS) |
en |
dc.relation.uri |
https://pubs.acs.org/doi/abs/10.1021/cg200667r |
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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/cg200667r |
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dc.subject |
Germanium |
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dc.subject |
Nanowire |
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dc.subject |
Heterostructure |
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dc.subject |
Core-shell |
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dc.subject |
Magnetic properties |
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dc.subject |
Structural characterization |
en |
dc.title |
Synthesis and magnetic characterization of co-axial Ge1-xMnx/a-Si heterostructures |
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dc.type |
Article (peer-reviewed) |
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dc.internal.authorcontactother |
Justin D. Holmes, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: j.holmes@ucc.ie |
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dc.internal.availability |
Full text available |
en |
dc.date.updated |
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 |
j.holmes@ucc.ie |
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 |