Evidence of Superparamagnetic Co Clusters in Pulsed Laser Deposition-Grown Zn<sub>0.9</sub>Co<sub>0.1</sub>O Thin Films Using Atom Probe Tomography

Lardé, R.; Talbot, Etienne; Pareige, P.; Bieber, H.; Schmerber, G.; Colis, S.; Pierron‐Bohnes, V.; Dinia, A.

doi:10.1021/ja108290u

Cited by 69 publications

(52 citation statements)

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“…remarked, though, that such metallic nanoparticles tend to be a feature of preparation by pulsed laser deposition [19,20], rather than the crystallisation from solution method employed here. The final point of interest from the XRD data is that the Debye-Sherrer formula yields approximate grain sizes that are broadly in line with those obtained from the AFM images.…”

Section: Accepted Manuscriptmentioning

confidence: 88%

“…examined on an expanded angle scale. However, the existence of very small Co nanoparticles cannot strictly be excluded by XRD data; while nanoparticles of ~5 nm diameter have yielded a distinct peak at ~44.4° in XRD [19], such particles of 3 nm diameter have been evidenced in atom probe tomography while leaving no signature in X-ray diffractograms [20]. It should be…”

Section: Accepted Manuscriptmentioning

confidence: 96%

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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: Accepted Manuscriptmentioning

confidence: 88%

Section: Accepted Manuscriptmentioning

confidence: 96%

Solution-based synthesis of cobalt-doped ZnO thin films

et al. 2012

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“…[21][22][23] Laser assisted APT has been recently used to study insulating materials. [24][25][26] It provides a better understanding of material nanostructure, allowing to quantify a phase separation process and to evidence clustering effects. To investigate Hf-silicate layer by this technique, tip shaped specimens were prepared by means of a dual-beam FIB-SEM (Zeiss NVision 40), using lift out method and an annular milling procedure.…”

Section: B Methods Used For Structure Analysismentioning

confidence: 99%

Atomic scale observation of phase separation and formation of silicon clusters in Hf higk-κ silicates

Talbot

Roussel

Genevois

et al. 2012

Journal of Applied Physics

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Articles you may be interested inThe effect of nanocrystallite size in monoclinic HfO 2 films on lattice expansion and near-edge optical absorption Appl. Phys. Lett. 96, 191904 (2010) Hafnium silicate films were fabricated by RF reactive magnetron sputtering technique. Fine microstructural analyses of the films were performed by means of high-resolution transmission electron microscopy and atom probe tomography. A thermal treatment of as-grown homogeneous films leads to a phase separation process. The formation of SiO 2 and HfO 2 phases as well as pure Si one was revealed. This latter was found to be amorphous Si nanoclusters, distributed uniformly in the film volume. Their mean diameter and density were estimated to be about 2.8 nm and (2.9 6 0.4) Â 10 17 Si-ncs/cm 3 , respectively. The mechanism of the decomposition process was proposed. The obtained results pave the way for future microelectronic and photonic applications of Hf-based high-j dielectrics with embedded Si nanoclusters. V C 2012 American Institute of Physics. [http://dx

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“…The observation of hysteresis loops and the difference between magnetization values measured in ZFC and FC conditions points to the super paramagnetic contribution to the magnetization [11][12][13]. The properties of superparamagnetic materials are essentially determined by blocking temperature T B .…”

Section: Discussionmentioning

confidence: 95%

“…Typically different nanoclusters have different blocking temperature. The following expression was derived for the calculation of blocking temperature distribution p(T B ) from the temperature dependence of magnetization [12,13]:…”

Section: Discussionmentioning

confidence: 99%

Superparamagnetic behavior of MOCVD grown ZnO:Co films

et al. 2018

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Abstract. Temperature and field dependences of magnetization have been measured for Co-doped ZnO films with different Co content grown by MOCVD on sapphire substrates. Measured field dependences of magnetization show ferromagnetic-like hysteresis loops and paramagnetic contribution. Coercive field decreases with an increase of Co content and temperature. The difference between temperature dependences of magnetization measured in zero field cooling and field cooling conditions was observed in the temperature range from 2 K to 300 K indicating superparamagnetic behaviour of the films. The distribution of blocking temperatures extracted from the temperature dependences of magnetization is broad and shifts to the low blocking temperatures with an increase of Co content

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Evidence of Superparamagnetic Co Clusters in Pulsed Laser Deposition-Grown Zn_0.9Co_0.1O Thin Films Using Atom Probe Tomography

Cited by 69 publications

References 67 publications

Solution-based synthesis of cobalt-doped ZnO thin films

Solution-based synthesis of cobalt-doped ZnO thin films

Atomic scale observation of phase separation and formation of silicon clusters in Hf higk-κ silicates

Superparamagnetic behavior of MOCVD grown ZnO:Co films

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Evidence of Superparamagnetic Co Clusters in Pulsed Laser Deposition-Grown Zn0.9Co0.1O Thin Films Using Atom Probe Tomography

Cited by 69 publications

References 67 publications

Solution-based synthesis of cobalt-doped ZnO thin films

Solution-based synthesis of cobalt-doped ZnO thin films

Atomic scale observation of phase separation and formation of silicon clusters in Hf higk-κ silicates

Superparamagnetic behavior of MOCVD grown ZnO:Co films

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Evidence of Superparamagnetic Co Clusters in Pulsed Laser Deposition-Grown Zn_0.9Co_0.1O Thin Films Using Atom Probe Tomography