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dc.contributor.authorDing, Xiang
dc.contributor.authorCui, Xiangyuan
dc.contributor.authorXiao, Chi
dc.contributor.authorLuo, Xi
dc.contributor.authorBao, Nina
dc.contributor.authorRusydi, Andrivo
dc.contributor.authorYu, Xiaojiang
dc.contributor.authorLu, Zunming
dc.contributor.authorDu, Yonghua
dc.contributor.authorGuan, Xinwei
dc.contributor.authorTseng, Li Ting
dc.contributor.authorLee, Wai Tung
dc.contributor.authorAhmed, Sohail
dc.contributor.authorZheng, Rongkun
dc.contributor.authorLiu, Tao
dc.contributor.authorWu, Tao
dc.contributor.authorDing, Jun
dc.contributor.authorSuzuki, Kiyonori
dc.contributor.authorLauter, Valeria
dc.contributor.authorVinu, Ajayan
dc.contributor.authorRinger, Simon P.
dc.contributor.authorYi, Jia Bao
dc.date.accessioned2019-12-05T13:41:33Z
dc.date.available2019-12-05T13:41:33Z
dc.date.issued2019-10-29
dc.identifier.citationDing, X., Cui, X., Xiao, C., Luo, X., Bao, N., Rusydi, A., … Yi, J. B. (2019). Confinement-Induced Giant Spin–Orbit-Coupled Magnetic Moment of Co Nanoclusters in TiO2 Films. ACS Applied Materials & Interfaces, 11(46), 43781–43788. doi:10.1021/acsami.9b15823
dc.identifier.doi10.1021/acsami.9b15823
dc.identifier.urihttp://hdl.handle.net/10754/660437
dc.description.abstractHigh magnetization materials are in great demand for the fabrication of advanced multifunctional magnetic devices. Notwithstanding this demand, the development of new materials with these attributes has been relatively slow. In this work, we propose a new strategy to achieve high magnetic moments above room temperature. Our material engineering approach invoked the embedding of magnetic nanoclusters in an oxide matrix. By precisely controlling pulsed laser deposition parameters, Co nanoclusters are formed in a 5 at % Co-TiO2 film. The presence of these nanoclusters was confirmed using transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray absorption fine structure. The film exhibits a very high saturation magnetization of 99 emu/cm3. Detailed studies using X-ray magnetic circular dichroism confirm that Co has an enhanced magnetic moment of 3.5 μB/atom, while the Ti and O also contribute to the magnetic moments. First-principles calculations supported our hypothesis that the metallic Co nanoclusters surrounded by a TiO2 matrix can exhibit both large spin and orbital moments. Moreover, a quantum confinement effect results in a high Curie temperature for the embedded Co nanoclusters. These findings reveal that 1-2 nm nanoclusters that are quantum confined can exhibit very large magnetic moments above room temperature, representing a promising advance for the design of new high magnetization materials.
dc.description.sponsorshipThe PNR research conducted at ORNL’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, and US Department of Energy. J.B.Y. would like to thank the research support for Australian Research Council (ARC) Future Fellowship (FT160100205). S.P.R. and R.Z. acknowledge support from the ARC (DP150100018). The authors acknowledge gratefully the scientific and technical support provided by the Microscopy Australia node at the University of Sydney (Sydney Microscopy & Microanalysis). J.B.Y. and X.D. would like to acknowledge gratefully the Australian National Fabrication Facility (ANFF) node at UNSW for technical support and access to the LaserMBE system. Prof. Jianhua Zhao is thanked for advice and support in relation to the SQUID measurements. Our calculations were undertaken with the assistance of resources from the National Computational Infrastructure (NCI) and the authors acknowledge the high-performance computing support from the Sydney Informatics Hub at the University of Sydney for expert facilitation of our access to the NCI. ANFF, Microscopy Australia, and the NCI are supported by the Australian Government under the National Collaborative Research Infrastructure Scheme (NCRIS) program.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acsami.9b15823
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, 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/10.1021/acsami.9b15823.
dc.titleConfinement-Induced Giant Spin-Orbit-Coupled Magnetic Moment of Co Nanoclusters in TiO2 Films
dc.typeArticle
dc.contributor.departmentMaterials Science and Engineering Program
dc.identifier.journalACS Applied Materials & Interfaces
dc.rights.embargodate2020-01-01
dc.eprint.versionPost-print
dc.contributor.institutionSchool of Materials Science and Engineering, UNSW Sydney, Kensington, NSW 2052, Australia
dc.contributor.institutionAustralian Centre for Microscopy & Microanalysis and School of Aerospace Mechanical and Mechatronic Engineering and School of Physics, The University of Sydney, Sydney, NSW 2006, Australia
dc.contributor.institutionDepartment of Physics and Singapore Synchrotron Light Source, National University of Singapore, 119077 Singapore
dc.contributor.institutionDepartment of Materials Science and Engineering and Singapore Synchrotron Light Source, National University of Singapore, 119260 Singapore
dc.contributor.institutionInstitute of Chemical and Engineering Science, Agency for Science Technology and Research (A∗STAR), 1 Pesek Road, Jurong Island, 627833 Singapore
dc.contributor.institutionBragg Institute, ANSTO, New Illawarra Road, Lucas Heights, Sydney, NSW 2234, Australia
dc.contributor.institutionKarls Tech GmbH, Fischreiher Strasse 3, Karlsruhe 76187, Germany
dc.contributor.institutionDepartment of Materials Science and Engineering, Monash University, Melbourne, Victoria 3800, Australia
dc.contributor.institutionNeutron Scattering Division Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
dc.contributor.institutionGlobal Innovative Center for Advanced Nanomaterials School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
kaust.personGuan, Xinwei
dc.date.published-online2019-10-29
dc.date.published-print2019-11-20


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