Synthesis and characterization of ferromagnetic Zn1-xCoxO films
SCIE
SCOPUS
- Title
- Synthesis and characterization of ferromagnetic Zn1-xCoxO films
- Authors
- Seo, SY; Kwak, CH; Kim, SH; Park, SH; Lee, IJ; Han, S
- Date Issued
- 2012-05-01
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- High-quality Zn1-xCoxO (ZnCoO) thin films with different Co concentrations (x=0-0.07) were synthesized on Al2O3 substrates using a radio-frequency magnetron sputtering process. The structural, chemical, optical, and electrical properties of the films were characterized using various techniques. High-resolution X-ray diffraction measurements showed that the ZnCoO films had a c-oriented hexagonal wurtzite structure with no extra phases. The lattice constants of the films increased slightly with increasing the Co concentration ratio. X-ray photoelectron spectra show the incorporation of Co2+ ions in the ZnO host without the formations of Co clusters. Hall measurements revealed that the films were n-type with a charge carrier density of similar to 2.6 x 10(18) per cm(3). A neutral-donor bound exciton peak ((DX)-X-0) from all specimens was observed at 3.36 eV using photoluminescence measurements at 10 K. The physical and chemical properties of the films suggested that their ferromagnetic properties originated from a direct exchange interaction between magnetic Co ions. (C) 2012 Elsevier B.V. All rights reserved.
- Keywords
- Crystal structure; Zinc compounds; Magnetic materials; Semiconducting II-VI materials; ZNO NANORODS; MAGNETIC SEMICONDUCTORS; ABSENCE; OXIDE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14119
- DOI
- 10.1016/J.JCRYSGRO.2012.02.022
- ISSN
- 0022-0248
- Article Type
- Article
- Citation
- JOURNAL OF CRYSTAL GROWTH, vol. 346, no. 1, page. 56 - 60, 2012-05-01
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