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Investigation of local structural environments and room-temperature ferromagnetism in (Fe,Cu)-codoped In2O3 diluted magnetic oxide films
An, YK; Xing, YY; Pan, F; Wu, ZH; Liu, JW; Wu ZH(吴忠华)
2016
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
EISSN1463-9084
Volume18Issue:19Pages:13701-13709
SubtypeArticle
AbstractThe local structural, optical, magnetic and transport properties of (In0.95-xFexCu0.05)(2)O-3 (0.06 <= x <= 0.20) films deposited by RF-magnetron sputtering have been systemically studied by different experimental techniques. Detailed structural analyses using XRD, XPS, EXAFS and full multiple-scattering ab initio theoretical calculations of Fe K-edge XANES show that the (In0.95-xFexCu0.05)(2)O-3 films have the same cubic bixbyite structure as pure In2O3. The doped Fe ions exist at both +2 and +3 oxidation states, substituting for the In3+ sites in the In2O3 lattice and forming a Fe-In + 2V(O) complex with the O vacancy in the first coordination shell of Fe. However, the co-doped Cu atoms are not incorporated into the In2O3 lattice and form the Cu metal clusters due to high ionization energy. UV-Vis measurements show that the optical band gap E-g decreases monotonically with the increase of Fe concentration, implying an increasing s-pd exchange interaction in the films. All the films display intrinsic room-temperature (RT) ferromagnetism and the saturated magnetization (M-s) increases monotonically with Fe doping. The temperature dependence of the resistivity data suggests the conduction mechanism of Mott variable-range hopping (VRH) at low temperature, confirming that the carriers are localized. It can be concluded that the observed RT ferromagnetism in the films originates from the overlapping of polarons mediated by oxygen vacancies based on the bound magnetic polaron (BMP) model. The variation of the localization effect of carriers with Fe doping can obviously adjust the magnetic exchange interaction in the (In0.95-xFexCu0.05)(2)O-3 films.
DOI10.1039/c6cp01315e
Indexed BySCI ; ADS
Language英语
WOS IDWOS:000376138000060
ADS Bibcode2016PCCP...1813701A
ADS URLhttps://ui.adsabs.harvard.edu/abs/2016PCCP...1813701A
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2016PCCP...1813701A/citations
Citation statistics
Cited Times:3 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/248030
Collection多学科研究中心
Recommended Citation
GB/T 7714
An, YK,Xing, YY,Pan, F,et al. Investigation of local structural environments and room-temperature ferromagnetism in (Fe,Cu)-codoped In2O3 diluted magnetic oxide films[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2016,18(19):13701-13709.
APA An, YK,Xing, YY,Pan, F,Wu, ZH,Liu, JW,&吴忠华.(2016).Investigation of local structural environments and room-temperature ferromagnetism in (Fe,Cu)-codoped In2O3 diluted magnetic oxide films.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,18(19),13701-13709.
MLA An, YK,et al."Investigation of local structural environments and room-temperature ferromagnetism in (Fe,Cu)-codoped In2O3 diluted magnetic oxide films".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 18.19(2016):13701-13709.
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