X-ray photoemission electron microscope determination of origins of room temperature ferromagnetism and photoluminescence in high co-content coxzn1-xo films.
(2014) In Surface Review and Letters 21(4).- Abstract
- In this paper, we reported on the X-ray photoemission electron microscope (XPEEM) determination of magnetic and luminescence origins for two CoxZn1-xO films. The cobalt fraction x of radio frequency co-sputtered samples were 0.86(2) and 0.92(2), respectively. Films were ferromagnetic and semiconductive. Unique narrow green color lines beside the ZnO intrinsic emissions were found with a decay time in microsecond range at room temperature. Origins of magnetic and luminescence properties were determined with XPEEM. The X-ray absorption near edge structure at the CoL3-edge denoted that Co was partially oxidized, and phase-contrast images together with chemical composition identification further proved that Co and CoO co-existed in the... (More)
- In this paper, we reported on the X-ray photoemission electron microscope (XPEEM) determination of magnetic and luminescence origins for two CoxZn1-xO films. The cobalt fraction x of radio frequency co-sputtered samples were 0.86(2) and 0.92(2), respectively. Films were ferromagnetic and semiconductive. Unique narrow green color lines beside the ZnO intrinsic emissions were found with a decay time in microsecond range at room temperature. Origins of magnetic and luminescence properties were determined with XPEEM. The X-ray absorption near edge structure at the CoL3-edge denoted that Co was partially oxidized, and phase-contrast images together with chemical composition identification further proved that Co and CoO co-existed in the samples. The ferromagnetism was attributed to ferromagnetism of Co clusters partially canceled by the antiferromagnetism of its oxide, and the photoluminescence to bound exciton in ZnO nanoclusters and defect related centers of ZnO nanoclusters in a Co-rich matrix. Present results show possibilities for adjusting magnetic and luminescence properties of Co-ZnO compounds by changing the cobalt concentration. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4659321
- author
- Cao, Wei ; Pankratov, Vladimir ; Huttula, Marko ; Shirmane, Liana ; Niu, Yuran LU and Wang, Feng
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Co-concentrated Co-ZnO films, photoluminescence, magnetism, synchrotron, radiation, photoemission electron microscope
- in
- Surface Review and Letters
- volume
- 21
- issue
- 4
- article number
- 1450058
- publisher
- World Scientific Publishing
- external identifiers
-
- wos:000340610900016
- scopus:84906101486
- ISSN
- 0218-625X
- DOI
- 10.1142/S0218625X14500589
- language
- English
- LU publication?
- yes
- id
- 5e440ad8-b030-44d0-80ee-f9a2720f2edf (old id 4659321)
- date added to LUP
- 2016-04-01 13:43:27
- date last changed
- 2022-03-21 20:03:50
@article{5e440ad8-b030-44d0-80ee-f9a2720f2edf,
abstract = {{In this paper, we reported on the X-ray photoemission electron microscope (XPEEM) determination of magnetic and luminescence origins for two CoxZn1-xO films. The cobalt fraction x of radio frequency co-sputtered samples were 0.86(2) and 0.92(2), respectively. Films were ferromagnetic and semiconductive. Unique narrow green color lines beside the ZnO intrinsic emissions were found with a decay time in microsecond range at room temperature. Origins of magnetic and luminescence properties were determined with XPEEM. The X-ray absorption near edge structure at the CoL3-edge denoted that Co was partially oxidized, and phase-contrast images together with chemical composition identification further proved that Co and CoO co-existed in the samples. The ferromagnetism was attributed to ferromagnetism of Co clusters partially canceled by the antiferromagnetism of its oxide, and the photoluminescence to bound exciton in ZnO nanoclusters and defect related centers of ZnO nanoclusters in a Co-rich matrix. Present results show possibilities for adjusting magnetic and luminescence properties of Co-ZnO compounds by changing the cobalt concentration.}},
author = {{Cao, Wei and Pankratov, Vladimir and Huttula, Marko and Shirmane, Liana and Niu, Yuran and Wang, Feng}},
issn = {{0218-625X}},
keywords = {{Co-concentrated Co-ZnO films; photoluminescence; magnetism; synchrotron; radiation; photoemission electron microscope}},
language = {{eng}},
number = {{4}},
publisher = {{World Scientific Publishing}},
series = {{Surface Review and Letters}},
title = {{X-ray photoemission electron microscope determination of origins of room temperature ferromagnetism and photoluminescence in high co-content coxzn1-xo films.}},
url = {{http://dx.doi.org/10.1142/S0218625X14500589}},
doi = {{10.1142/S0218625X14500589}},
volume = {{21}},
year = {{2014}},
}