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- Title
Structural, optical and magnetic properties of Cr doped InO powders and thin films.
- Authors
Sai Krishna, N.; Kaleemulla, S.; Amarendra, G.; Madhusudhana Rao, N.; Krishnamoorthi, C.; Omkaram, I.; Sreekantha Reddy, D.
- Abstract
The (InCr)O powders as well as thin films of x = 0.03, 0.05 and 0.07 were synthesized using a solid state reaction and an electron beam evaporation technique (on glass substrate), respectively. The influence of Cr doping concentration on structural, optical and magnetic properties of the InO samples was systematically studied. The X-ray diffraction results confirmed that all the Cr doped InO samples exist cubic structure of InO without any secondary phases presence. The chemical composition analyses showed that all the Cr doped InO compounds were nearly stoichiometric. The X-ray photoelectron spectroscopy analysis of the Cr doped InO thin films showed an increase of oxygen vacancies with Cr concentration and the existence of Cr as Cr state in the host InO lattice. A small blue shift in the optical band gap was observed in the powder compounds, when the dopant concentration increased from x = 0.03 to x = 0.07. In thin films, the band gap found to increase from 3.63 to 3.74 eV, with an increase of Cr concentration. The magnetic measurements show that the undoped InO bulk powder sample has the diamagnetic property at room temperature. And a trace of paramagnetism was observed in Cr doped InO powders. However (InCr)O thin films (x = 0.00, 0.03, 0.05 and 0.07) samples shows soft ferromagnetism. The observed ferromagnetism in thin films are attributed to oxygen vacancies created during film prepared in vacuum conditions. The ferromagnetic exchange interactions are established between metal cations via free electrons trapped in oxygen vacancies (F-centers).
- Subjects
THIN films; MAGNETIC properties; SOLID state electronics; X-ray diffraction; PARAMAGNETISM
- Publication
Journal of Materials Science: Materials in Electronics, 2015, Vol 26, Issue 11, p8635
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-015-3538-6