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Title: Room temperature ferromagnetism in Co doped ZnO within an optimal doping level of 5%

Abstract

Highlights: ► Zn{sub 1−x}Co{sub x}O ((0 ≤ x ≤ 0.1)) system synthesized by solid state reaction technique. ► Observation of room temperature ferromagnetism for 3 and 5% Co doped ZnO. ► XPS and EPMA studies predict the occurrence of segregated CoO clusters. ► Suppresses ferromagnetic ordering in higher doping percentage of Co (>5%). -- Abstract: We report on the structural, micro-structural and magnetic properties of Zn{sub 1−x}Co{sub x}O (0 ≤ x ≤ 0.1) system. Electron probe micro-structural analysis on 5% Co doped ZnO indicates the presence of segregated cobalt oxide which is also confirmed from the Co 2p core level X-ray photoelectron spectrum. The presence of oxygen defects in lower percentage of Co doped ZnO (≤5%) enhances the carrier mediated exchange interaction and thereby enhancing the room-temperature ferromagnetic behaviour. Higher doping percentage of cobalt (>5%) creates weak link between the grains and suppresses the carrier mediated exchange interaction. This is the reason why room temperature ferromagnetism is not observed in 7% and 10% Co doped ZnO.

Authors:
 [1];  [2]; ;  [3];  [1];  [4];  [2]
  1. Department of Physics, Institute of Technical Education and Research, Siksha ‘O’ Anusandhana University, Bhubaneswar 751030, Orissa (India)
  2. Advanced Materials Technology Department, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar 751013, Orissa (India)
  3. Department of Physics, Indian Institute of Technology, Guwahati 781039 (India)
  4. UGC-DAE, CSR, University Campus, Khandwa Road, Indore 452001 (India)
Publication Date:
OSTI Identifier:
22215107
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 6; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT OXIDES; DOPED MATERIALS; ELECTRON PROBES; EXCHANGE INTERACTIONS; FERROMAGNETISM; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; RAMAN SPECTROSCOPY; SEMICONDUCTOR MATERIALS; SOLIDS; X RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; ZINC OXIDES

Citation Formats

Mohapatra, J., Mishra, D.K., E-mail: dilipiuac@gmail.com, Mishra, Debabrata, Perumal, A., Medicherla, V.R.R., Phase, D.M., and Singh, S.K. Room temperature ferromagnetism in Co doped ZnO within an optimal doping level of 5%. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.02.046.
Mohapatra, J., Mishra, D.K., E-mail: dilipiuac@gmail.com, Mishra, Debabrata, Perumal, A., Medicherla, V.R.R., Phase, D.M., & Singh, S.K. Room temperature ferromagnetism in Co doped ZnO within an optimal doping level of 5%. United States. doi:10.1016/J.MATERRESBULL.2012.02.046.
Mohapatra, J., Mishra, D.K., E-mail: dilipiuac@gmail.com, Mishra, Debabrata, Perumal, A., Medicherla, V.R.R., Phase, D.M., and Singh, S.K. Fri . "Room temperature ferromagnetism in Co doped ZnO within an optimal doping level of 5%". United States. doi:10.1016/J.MATERRESBULL.2012.02.046.
@article{osti_22215107,
title = {Room temperature ferromagnetism in Co doped ZnO within an optimal doping level of 5%},
author = {Mohapatra, J. and Mishra, D.K., E-mail: dilipiuac@gmail.com and Mishra, Debabrata and Perumal, A. and Medicherla, V.R.R. and Phase, D.M. and Singh, S.K.},
abstractNote = {Highlights: ► Zn{sub 1−x}Co{sub x}O ((0 ≤ x ≤ 0.1)) system synthesized by solid state reaction technique. ► Observation of room temperature ferromagnetism for 3 and 5% Co doped ZnO. ► XPS and EPMA studies predict the occurrence of segregated CoO clusters. ► Suppresses ferromagnetic ordering in higher doping percentage of Co (>5%). -- Abstract: We report on the structural, micro-structural and magnetic properties of Zn{sub 1−x}Co{sub x}O (0 ≤ x ≤ 0.1) system. Electron probe micro-structural analysis on 5% Co doped ZnO indicates the presence of segregated cobalt oxide which is also confirmed from the Co 2p core level X-ray photoelectron spectrum. The presence of oxygen defects in lower percentage of Co doped ZnO (≤5%) enhances the carrier mediated exchange interaction and thereby enhancing the room-temperature ferromagnetic behaviour. Higher doping percentage of cobalt (>5%) creates weak link between the grains and suppresses the carrier mediated exchange interaction. This is the reason why room temperature ferromagnetism is not observed in 7% and 10% Co doped ZnO.},
doi = {10.1016/J.MATERRESBULL.2012.02.046},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 6,
volume = 47,
place = {United States},
year = {2012},
month = {6}
}