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dc.contributor.authorRoqan, Iman S.
dc.contributor.authorDevi, Assa Aravindh Sasikala
dc.contributor.authorVenkatesh, Singaravelu
dc.date.accessioned2017-04-10T07:49:51Z
dc.date.available2017-04-10T07:49:51Z
dc.date.issued2016-08-24
dc.identifier.citationRoqan IS, Aravindh SA, Venkatesh S (2016) Magnetic Properties of Gadolinium-Doped ZnO Films and Nanostructures. Magnetic Materials. Available: http://dx.doi.org/10.5772/63320.
dc.identifier.doi10.5772/63320
dc.identifier.urihttp://hdl.handle.net/10754/623095
dc.description.abstractThe magnetic properties of Gd-doped ZnO films and nanostructures are important to the development of next-generation spintronic devices. Here, we elucidate the significant role played by Gd-oxygen-deficiency defects in mediating/inducing ferromagnetic coupling in in situ Gd-doped ZnO thin films deposited at low oxygen pressure by pulsed laser deposition (PLD). Samples deposited at higher oxygen pressures exhibited diamagnetic responses. Vacuum annealing was used on these diamagnetic samples (grown at a relatively high oxygen pressures) to create oxygen- deficiency defects with the aim of demonstrating reproducibility of room-temperature ferromagnetism (RTFM). Samples annealed at oxygen environment exhibited super- paramagnetism and blocking-temperature effects. The samples possessed secondary phases; Gd segregation led to superparamagnetism. Theoretical studies showed a shift of the 4f level of Gd to the conduction band minimum (CBM) in Gd-doped ZnO nanowires, which led to an overlap with the Fermi level, resulting in strong exchange coupling and consequently RTFM.
dc.description.sponsorshipThe authors would like to thank the team involved in this study. In particular, we thank Zhenkui Zhank, Shamima Hussain, Tahani H. Flemban, and Ioannis Bantounas from our group at KAUST. We thank J.B. Franklin, B. Zou, P.K. Petrov, M.P. Ryan, and N.M. Alford from Imperial College London and J-S. Lee from the Stanford Synchrotron Radiation Light- source, SLAC National Accelerator Laboratory. We thank P. Edwards, K.P. O’Donnell, and R.W. Martin for providing access to the EPMA for WDX measurements at the University of Strathclyde. We thank Ratnamal Chatterjees’s group at IIT Delhi, India, for conducting the SQUID experiments.
dc.publisherIntechOpen
dc.relation.urlhttp://www.intechopen.com/books/magnetic-materials/magnetic-properties-of-gadolinium-doped-zno-films-and-nanostructures
dc.rightsThis chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0
dc.subjectZnO
dc.subjectDMS
dc.subjectferromagnetism
dc.subjectGd
dc.subjectrare earth
dc.titleMagnetic Properties of Gadolinium-Doped ZnO Films and Nanostructures
dc.typeBook Chapter
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentSemiconductor and Material Spectroscopy (SMS) Laboratory
dc.identifier.journalMagnetic Materials
dc.eprint.versionPublisher's Version/PDF
kaust.personRoqan, Iman S.
kaust.personDevi, Assa Aravindh Sasikala
kaust.personVenkatesh, Singaravelu
refterms.dateFOA2018-06-14T02:15:31Z


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This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution,
and reproduction in any medium, provided the original work is properly cited.
Except where otherwise noted, this item's license is described as This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.