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Croissance et caractérisations de films minces de ZnO et ZnO dopé cobalt préparés par ablation laser pulsé

Abstract : Spintronics is an emergent area of research that exploits the quantum propensity of electrons to spin as well as utilizing their charge state, allowing microelectronic devices to be devised with additional functionality. Indeed, a great deal of research activity has been focused on dilute magnetic semiconductors (DMS) owing to their potential application as room temperature spintronic devices. This is based on recent theoretical calculations that predict it is possible to design DMS materials possessing ferromagnetic transitions (FM-Tc) above room temperature by doping a magnetic element into a host wide bandgap semiconductor (e.g., Co-doped ZnO). However, the origin of ferromagnetism in these DMS materials is still subject of controversy, and questions remain:
- Is ferromagnetism in DMS intrinsic or extrinsic?
- what is the mechanism relative to the magnetic interactions?
To address these questions, we have developed a novel strategy for the pulsed laser deposition of Co-doped ZnO films that utilizes metallic targets as the source of cationic elements. First, the growth conditions for ZnO films were optimized, and then subsequently utilized to deposit Co-doped ZnO films. Second, because this method allows for the precise control of the Co/Zn composition the growth conditions for certain amounts of cobalt doped into ZnO also were systematically studied. As a result, we have correlated the presence of ferromagnetism to film defects, results which have supported by recent theoretical calculations. Moreover, these results were corroborated by a comparative study between Co-doped ZnO films grown by ceramic and metallic targets.
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Contributor : Arnaud Fouchet <>
Submitted on : Wednesday, December 19, 2007 - 12:53:24 PM
Last modification on : Tuesday, December 8, 2020 - 11:28:02 AM
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  • HAL Id : tel-00199703, version 1

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A. Fouchet. Croissance et caractérisations de films minces de ZnO et ZnO dopé cobalt préparés par ablation laser pulsé. Matière Condensée [cond-mat]. Université de Caen, 2006. Français. ⟨tel-00199703⟩

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