Electronic structure and magnetic properties of Co doped TiO2 thin films using X-ray absorption spectroscopy

Title
Electronic structure and magnetic properties of Co doped TiO2 thin films using X-ray absorption spectroscopy
Authors
Shalendra KumarJ.S.ParkD.J.KimM.H.LeeTaeKwonSongSanjeevGautam채근화S.S.KimM.-H.Kim
Keywords
Magneticproperties; Electronicmaterial; Thin film; PLD; NEXAFS
Issue Date
2015-11
Publisher
Ceramics international
Citation
VOL 41, S370-S375
Abstract
The thin film of Ti0.93Co0.05O2-delta has been grown on LaAlO3 (100) substrate using pulsed laser deposition method. X-ray diffraction, near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, X-ray magnetic circular dichroism (XMCD) and magnetic hysteresis loop measurements were used to fully understand the origin of ferromagnetism. Our structural analysis reveals a single phase nature of the film and excludes the presence of any secondary phase. NEXAFS spectra collected at Ti L-3,L-2, and Co L-3,L-2 -edge infer that Co and Ti ions are in 2+ and 4+ valence states, respectively. Multiplet calculation performed at Co L-3,L-2 -edge also support the experimental observations and shows that Co ions are in 2+ valence state in O-h (octahedral) symmetry. Zero field cooled and field cooled magnetization infer that T-C of Ti0.95Co0.05O2-delta film is above room temperature. DC magnetization hysteresis loop study and XMCD measurement at Co L-3,L-2 -edge reflect that Ti0.95Co0.05O2-delta film exhibits ferromagnetic ordering at room temperature
URI
http://pubs.kist.re.kr/handle/201004/50478
ISSN
02728842
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KIST Publication > Article
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