Optimization of La0.7Ba0.3MnO3−δ complex oxide laser ablation conditions by plume imaging and optical emission spectroscopy

Amoruso, S.; Aruta, C.; Bruzzese, R.; Maccariello, D.; Maritato, L.; Granozio, F. Miletto; Orgiani, P.; Scotti di Uccio, U.; Wang, X.

doi:doi:10.1063/1.3467770

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Spherical and cylindrical imploding and exploding shock waves in plasma system dominated by pair production

The propagation of ion acoustic shock waves in cylindrical and spherical geometries has been investigated. The plasma system consists of cold ions, Boltzmannian electrons and positrons. Spherical, cylindrical Korteweg–de Vries–Burger equations have been derived by reductive perturbation technique and their shock behavior is studied by employing finite difference method. Our main emphasis is on the behavior of shock as it moves toward and away from center of spherical and cylindrical geometries....

Low temperature plasma enhanced chemical vapor deposition of thin films combining mechanical stiffness, electrical insulation, and homogeneity in microcavities

The deposition of hydrogenated amorphous carbon (a-C:H) as well as hydrogenated amorphous silicon carbonitride (SiCN:H) films was investigated in view of a simultaneous realization of a minimum Young’s modulus (>70 GPa), a high electrical insulation ( ≥ 1 MV/cm), a low permittivity and the uniform coverage of microcavities with submillimeter dimensions. For the a-C:H deposition the precursors methane (CH4) and acetylene (C2H2) were used, while SiCN:H films were deposited from mixtures of tri...

The properties of thin films of complex oxides, such as La_1−xD_xMnO_3−δ (D = Ba, Ca, Sr, etc.), produced by pulsed laser deposition depend critically on the experimental parameters in which laser ablation is carried out. Here, we report a comparative analysis of the pulsed laser ablation process of La_0.7Ba_0.3MnO_3−δ, in oxygen background, in the ambient pressure range from 10⁻² to 1 mbar, typically employed in pulsed laser deposition of manganites. The laser ablation plume was studied by using time-gated imaging and optical emission spectroscopy techniques. It was found that at a pressure of ≈ 10⁻² mbar, the plume species arriving at the substrate are characterized by hyperthermal kinetic energy ( ≈ 10 eV), and high degree of excitation. On the contrary, at larger oxygen pressure (0.1–1 mbar), the velocity of plume species reaching the substrate, and their degree of excitation are much reduced by the confining effects of the background gas. These features explain why an appropriate choice of the experimental conditions in which the deposition process is carried out leads to better quality films, providing helpful indications to improve control over the growth process of both La_1−xD_xMnO_3−δ and other perovskitic oxides.

Article Outline

INTRODUCTION
EXPERIMENTAL METHODS
RESULTS AND DISCUSSION
1. PLA of LBMO: effect of the background oxygen at T_s = 670 °C
2. PLA of LBMO: Effect of the substrate temperature on the plume propagation, at P_g = 2×10⁻² mbar
3. PLA of LBMO: Effect of the laser pulse fluence on the plume propagation, at P_g = 2×10⁻² mbar
CONCLUSIONS

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KEYWORDS and PACS

Keywords

barium compounds, lanthanum compounds, pulsed laser deposition, vapour deposited coatings

PACS

81.15.Fg

Pulsed laser ablation deposition
68.55.A-

Nucleation and growth
52.38.Mf

Laser ablation

ARTICLE DATA

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http://dx.doi.org/10.1063/1.3467770

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0021-8979 (print)

1089-7550 (online)

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$abstract.society.value is a Member of CrossRef

American Institute of Physics

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