Study of diluted magnetic semiconductor: Co-doped ZnO

Lee, Hyeon-Jun; Jeong, Se–Young; Cho, Chae Ryong; Park, Chul Hong

doi:10.1063/1.1517405

Cited by 661 publications

(336 citation statements)

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“…They were tested in a magnetic field of field strength in the range ± 10 4 Oe that was available to us, but the response appears to be essentially paramagnetic in nature. We consider this aspect of the study with reference to the work of Singhal et al [50] in which it was noted that a ferromagnetic response did not develop in Co-doped ZnO nanocrystals until the Co doping reached higher levels -namely, samples with 5 or 7 wt% of Co in that case.…”

Section: Comment On Magnetic Properties With Reference To Raman Datamentioning

confidence: 99%

“…In particular, in this article we address the synthesis and properties of Codoped ZnO as an interesting class of transparent semiconductor with, also, potential functionality as a dilute magnetic semiconductor at room temperature. Although it is acknowledged that the origin of ferromagnetism in transition-metal doped ZnO is not yet very well understood [1] it is nonetheless clear that ZnO is a candidate material for room temperature semiconductor (bipolar) spintronics, as evidenced by increasing interest in experimental studies of in this area [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Solution-based synthesis of cobalt-doped ZnO thin films

et al. 2012

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Publisher rights This is the author's version of a work that was accepted for publication in Thin Solid Films. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Thin Solid Films, Vol. 524, 01/12/2012 General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights.Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact openaccess@qub.ac.uk. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT1 Solution-based synthesis of cobalt-doped ZnO thin films Sesha VempatiSchool of Mathematics and Physics, Queen's University Belfast, BT7 1NN, UK, Amitha ShettyMaterials Research Center, Indian Institute of Science, Bangalore -560012, India. P. Dawson*School of Mathematics and Physics, Queen's University Belfast, BT7 1NN, UK, K. K. Nanda and S.B. KrupanidhiMaterials Research Center, Indian Institute of Science, Bangalore -560012, India.Corresponding author: p.dawson@qub.ac.uk AbstractUndoped and cobalt-doped (1-4 wt%) ZnO polycrystalline, thin films have been fabricated on quartz substrates using sequential spin-casting and annealing of simple salt solutions. X-ray diffraction (XRD) reveals a wurzite ZnO crystalline structure with high-resolution transmission electron microscopy showing lattice planes of separation 0.26 nm, characteristic of (002) planes.The Co appears to be tetrahedrally co-ordinated in the lattice on the Zn sites (XRD) and has a charge of +2 in a high-spin electronic state (X-ray photoelectron spectroscopy). Co-doping does not alter the wurzite structure and there is no evidence of the precipitation of cobalt oxide phases within the limits of detection of Raman and XRD analysis. Lattice defects and chemisorbed oxygen are probed using photoluminescence and Raman spectroscopy -crucially, however, this transparent semiconduc...

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Section: Comment On Magnetic Properties With Reference To Raman Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solution-based synthesis of cobalt-doped ZnO thin films

et al. 2012

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“…In spite of numerous studies the ferromagnetic properties of transition metal cations doped wurtzite ZnO host is still a controversial issue [1][2][3][4][5][6]. A high temperature ferromagnetism was reported numerously for Co doped ZnO in thin films produced by all accessible methods including pulsed layer deposition [7], the magnetron co-sputtering [8], the solgel method [9], and epitaxial thin films [10]. Recently, Fe doped ZnO nanostructures, synthesized by the sol-gel method, were observed to be ferromagnetic [11].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fe doped ZnO nanofibers obtained by electrospinning

Baranowska‐Korczyc

Reszka

Sobczak

et al. 2011

J Sol-Gel Sci Technol

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We demonstrate structural and room temperature magnetic properties of Fe doped ZnO nanofibers (NFs) obtained by electrospinning followed by calcination. The observed NFs, formed from crystalographically oriented, approximately 4.5 nm particles conglomerates, were approximately 200 nm in diameter. The reported synthesis of room temperature ferromagnetic Fe doped ZnO NFs is both facile and economical, and is therefore suggested as a generic method of fabricating biocompatible magnetic materials. The major substrates selected for the NFs synthesis (Zn, Fe) comprised of relatively low toxicity materials. Incorporating 10% Fe into ZnO does not modify the wurtzite crystal structure of the host material. No evidence of impurity phase was detected by either X-ray or electron diffraction. Magnetometry studies and Magnetic Force Microscopy imaging reveal a local ferromagnetic order that persists up to room temperature. We suggest that the observed phenomenon is either due to a mechanism mediated by presence of oxygen vacancies and/or is related to iron-rich precipitates.

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“…[2][3][4][5][6] Electron paramagnetic resonance ͑EPR͒ measurements show that it is possible to produce Zn 1−x Co x O with x ഛ 0.1 ͑Refs. 7-9͒ in which Co is substituted for Zn rather than forming clusters.…”

Section: Introductionmentioning

confidence: 99%