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postgraduate thesis: Annealing studies on the structural and magnetical properties of Co implanted ZnO single crystal

TitleAnnealing studies on the structural and magnetical properties of Co implanted ZnO single crystal
Authors
Advisors
Advisor(s):Ling, FCC
Issue Date2012
PublisherThe University of Hong Kong (Pokfulam, Hong Kong)
Citation
Zou, L. [邹兰兰]. (2012). Annealing studies on the structural and magnetical properties of Co implanted ZnO single crystal. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4979969
AbstractAs a wide band gap semiconductor, Zinc Oxide (ZnO) has recently attracted considerable attention due to its wide applicability. Transition metal (TM) doped ZnO is one of the most intensive research field in the last decade because of its possible application in spintronics devices. The Co-implanted ZnO has been considered as one of the most promising candidate in the field of diluted magnetic semiconductor (DMS). In this study, the magnetic and structural properties of Co-implanted ZnO single crystal were investigated. ZnO single crystals were implanted with 100 keV-Co ions at 300K with a fluence of 1014cm-2and subsequently annealed at 750oC and 900oC respectively. The samples were studied by secondary ion mass spectrometry, X-ray diffraction, photoluminescence, X-ray photoemission spectroscopy and vibrating sample magnetometer. The as-implanted sample seemed to be phase pure while the spinel secondary phase ZnCo2O4 was present in 750oC and 900oC samples showed trace ofCo3O4,Zn0.52Co2.48O4 and metallic Co cluster. All the samples exhibited ferromagnetism at room temperature in low field region, and the magnetic moment was found to decrease and increase after the heat treatment. In high field region, typical paramagnetism was the dominating magnetic property. More than one ferromagnetic mechanism is involved to explain the experimental results.
DegreeMaster of Philosophy
SubjectZinc oxide.
Annealing of crystals.
Dept/ProgramPhysics
Persistent Identifierhttp://hdl.handle.net/10722/181535

 

DC FieldValueLanguage
dc.contributor.advisorLing, FCC-
dc.contributor.authorZou, Lanlan.-
dc.contributor.author邹兰兰.-
dc.date.accessioned2013-03-03T03:21:04Z-
dc.date.available2013-03-03T03:21:04Z-
dc.date.issued2012-
dc.identifier.citationZou, L. [邹兰兰]. (2012). Annealing studies on the structural and magnetical properties of Co implanted ZnO single crystal. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4979969-
dc.identifier.urihttp://hdl.handle.net/10722/181535-
dc.description.abstractAs a wide band gap semiconductor, Zinc Oxide (ZnO) has recently attracted considerable attention due to its wide applicability. Transition metal (TM) doped ZnO is one of the most intensive research field in the last decade because of its possible application in spintronics devices. The Co-implanted ZnO has been considered as one of the most promising candidate in the field of diluted magnetic semiconductor (DMS). In this study, the magnetic and structural properties of Co-implanted ZnO single crystal were investigated. ZnO single crystals were implanted with 100 keV-Co ions at 300K with a fluence of 1014cm-2and subsequently annealed at 750oC and 900oC respectively. The samples were studied by secondary ion mass spectrometry, X-ray diffraction, photoluminescence, X-ray photoemission spectroscopy and vibrating sample magnetometer. The as-implanted sample seemed to be phase pure while the spinel secondary phase ZnCo2O4 was present in 750oC and 900oC samples showed trace ofCo3O4,Zn0.52Co2.48O4 and metallic Co cluster. All the samples exhibited ferromagnetism at room temperature in low field region, and the magnetic moment was found to decrease and increase after the heat treatment. In high field region, typical paramagnetism was the dominating magnetic property. More than one ferromagnetic mechanism is involved to explain the experimental results.-
dc.languageeng-
dc.publisherThe University of Hong Kong (Pokfulam, Hong Kong)-
dc.relation.ispartofHKU Theses Online (HKUTO)-
dc.rightsThe author retains all proprietary rights, (such as patent rights) and the right to use in future works.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.source.urihttp://hub.hku.hk/bib/B49799691-
dc.subject.lcshZinc oxide.-
dc.subject.lcshAnnealing of crystals.-
dc.titleAnnealing studies on the structural and magnetical properties of Co implanted ZnO single crystal-
dc.typePG_Thesis-
dc.identifier.hkulb4979969-
dc.description.thesisnameMaster of Philosophy-
dc.description.thesislevelMaster-
dc.description.thesisdisciplinePhysics-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.5353/th_b4979969-
dc.date.hkucongregation2013-

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