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Open AccessArticle

In-Situ Plasma Monitoring during the Pulsed Laser Deposition of Ni60Ti40 Thin Films

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Materials Science and Engineering Faculty, Technical University “Gh. Asachi” from Iasi, 700506 Iași, Romania
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Physic Faculty, “Al. I. Cuza” University from Iasi, 700506 Iași, Romania
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Integrated Center for Studies in Environmental Science for North-East Region (CERNESIM), Alexandru Ioan Cuza University of Iasi, 700506 Iasi, Romania
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Physics Department, Faculty of Applied Sciences, University Politehnica of Bucharest, 010614 Bucharest, Romania
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Department of Physics, “Gh. Asachi” Technical University of Iasi, 700050 Iasi, Romania
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Romanian Scientists Academy, 54 Splaiul Independentei, 050094 Bucharest, Romania
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National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Bucharest, Romania
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Authors to whom correspondence should be addressed.
Symmetry 2020, 12(1), 109; https://doi.org/10.3390/sym12010109 (registering DOI)
Received: 14 December 2019 / Revised: 28 December 2019 / Accepted: 30 December 2019 / Published: 6 January 2020
(This article belongs to the Special Issue Advances in Laser Produced Plasmas Research)
The properties of pulsed laser deposited of Ni60Ti40 shape memory thin films generated in various deposition conditions were investigated. In-situ plasma monitoring was implemented by means of space- and time-resolved optical emission spectroscopy, and ICCD fast camera imaging. Structural and chemical analyses were performed on the thin films using SEM, AFM, EDS, and XRD equipment. The deposition parameters influence on the chemical composition of the thin films was investigated. The peeled layer presented on DSC a solid-state transformation in a different transformation domain compared to the target properties. A fractal model was used to describe the dynamics of laser produced plasma through various non-differentiable functionalities. Through hydrodynamic type regimes, space-time homographic transformations were correlated with the global dynamics of the ablation plasmas. Spatial simultaneity of homographic transformation through a special SL(2R) invariance implies the description of plasma dynamics through Riccati type equations, establishing correlations with the optical emission spectroscopy measurements. View Full-Text
Keywords: nitinol; pulsed laser deposition; in situ plasma monitoring; thin films; fractal modelling; SL(2R) invariance; homographic transformations; Riccati equation nitinol; pulsed laser deposition; in situ plasma monitoring; thin films; fractal modelling; SL(2R) invariance; homographic transformations; Riccati equation
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Cimpoesu, N.; Gurlui, S.; Bulai, G.; Cimpoesu, R.; Paun, V.-P.; Irimiciuc, S.A.; Agop, M. In-Situ Plasma Monitoring during the Pulsed Laser Deposition of Ni60Ti40 Thin Films. Symmetry 2020, 12, 109.

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