Influence of grain boundary weak links on the nonequilibrium response of YBaCuO thin films to short laser pulses

1994 ◽  
Vol 7 (4) ◽  
pp. 751-755 ◽  
Author(s):  
Gregory N. Gol'tsman ◽  
Ivan G. Goghidze ◽  
Pavel B. Kouminov ◽  
Boris S. Karasik ◽  
Alexei D. Semenov ◽  
...  
Keyword(s):  
Thin Films ◽  
Grain Boundary ◽  
Laser Pulses ◽  
Weak Links ◽  
Short Laser Pulses

scholarly journals LASER-INDUCED SURFACE ACOUSTIC WAVES FOR THIN FILM CHARACTERIZATION

2020 ◽  
Vol 27 ◽  
pp. 57-61
Author(s):  
Radim Kudělka ◽  
Lukáš Václavek ◽  
Jan Tomáštík ◽  
Sabina Malecová ◽  
Radim Čtvrtlík
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Young’S Modulus ◽  
Acoustic Waves ◽  
Young's Modulus ◽  
Surface Acoustic Waves ◽  
Laser Pulses ◽  
Data Application ◽  
Thin Film Characterization ◽  
Short Laser Pulses

Knowledge of mechanical properties of thin films is essential for most of their applications. However, their determination can be problematic for very thin films. LAW (Laser-induced acoustic waves) is a combined acousto-optic method capable of measuring films with thickness from few nanometers. It utilizes ultrasound surface waves which are excited via short laser pulses and detected by a PVDF foil. Properties such as Young’s modulus, Poisson’s ratio and density of both the film and the substrate as well as film thickness can be explored.Results from the LAW method are successfully compared with nanoindentation for Young’s modulus evaluation and with optical method for film thickness evaluation and also with literature data. Application of LAW for anisotropy mapping of materials with cubic crystallographic lattice is also demonstrated.

YBa2Cu3O7−x Grain Boundary Weak Links on MgO Bicrystal

1992 ◽  
Vol 275 ◽  
Author(s):  
H. B. Lu ◽  
S. L. Tu ◽  
J. J. Wang ◽  
J. Lin ◽  
T. W. Huang ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Weak Link ◽  
Weak Links ◽  
Artificial Boundaries ◽  
Tilt Boundaries ◽  
Preliminary Study ◽  
High Degree

ABSTRACTThe characteristics of YBa2Cu3O7−x (YBCO) thin films by laser ablation on MgO bicrystals have been investigated. The bicrystals were fabricated by hot pressing two single crystals with the configuration of [001] tilt boundaries. The YBCO films were epitaxial grown with C-axis normal to the both adjacent grains of bicrystals. The FWHM about (005) reflection was 0.4–0.5 degree, indicating the high degree of the oriention for the film with small mosaic spread. Our preliminary study showed that the typical value of Jc on either side of the bicrystal boundary was 0.4–10×106 A/cm2 at 15K, while that across the 10° tilt boundaries was 0.3–9×105 A/cm2 at 15K. These results implied that the artificial grain boundaries effectively weakened the supercurrent, and therefore, the weak-link properties of artificial boundaries were more easily controllable than those of naturally occuring grain boundaries.

Nanoscale Heat Transport through Epitaxial Ultrathin Hetero Films: Bi(111)/Si(001) and Bi(111)/Si(111)

2012 ◽  
Vol 1404 ◽  
Author(s):  
Anja Hanisch-Blicharski ◽  
Simone Wall ◽  
Annika Kalus ◽  
Tim Frigge ◽  
Michael Horn- von Hoegen
Keyword(s):  
Thin Films ◽  
Electron Diffraction ◽  
Linear Dependence ◽  
Decay Constant ◽  
Laser Pulses ◽  
Ultrafast Electron Diffraction ◽  
Cooling Process ◽  
Nanoscale Heat Transport ◽  
Acoustic Mismatch ◽  
Short Laser Pulses

ABSTRACTThe cooling process of ultrathin hetero films upon excitation with short laser pulses was studied for epitaxial Bi(111) films on Si(001) and Si(111) substrates by means of the Debye-Waller effect with ultrafast electron diffraction. From the exponential decay of the temperature, a cooling time constant was determined as a function of thickness for both substrates. For Bi/Si(111), a linear dependence between the decay constant and thickness was observed, even for 2.8 nm thin films , as predicted from the diffuse mismatch model (DMM) and the acoustic mismatch model (AMM). However, with Bi/Si(001), a significant deviation from this linear dependence was observed for film thicknesses below 5 nm.

scholarly journals Annealing of SnO_2 thin films by ultra-short laser pulses

2014 ◽  
Vol 22 (S3) ◽  
pp. A607 ◽  
Author(s):  
D. Scorticati ◽  
A. Illiberi ◽  
T. Bor ◽  
S.W.H. Eijt ◽  
H. Schut ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Pulses ◽  
Short Laser Pulses

Thermal annealing using ultra-short laser pulses to improve the electrical properties of Al:ZnO thin films

2015 ◽  
Vol 98 ◽  
pp. 327-335 ◽  
Author(s):  
D. Scorticati ◽  
A. Illiberi ◽  
T.C. Bor ◽  
S.W.H. Eijt ◽  
H. Schut ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Thermal Annealing ◽  
Laser Pulses ◽  
Short Laser Pulses

Laser lift-off initiated by direct induced ablation of different metal thin films with ultra-short laser pulses

2012 ◽  
Vol 45 (31) ◽  
pp. 315303 ◽  
Author(s):  
Gerhard Heise ◽  
Matthias Domke ◽  
Jan Konrad ◽  
Sebastian Sarrach ◽  
Jürgen Sotrop ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Pulses ◽  
Metal Thin Films ◽  
Short Laser Pulses ◽  
Lift Off

Femtosecond Pulses as a New Photonic Source for Growing Thin Films by Pulsed-laser Deposition

2003 ◽  
Vol 780 ◽  
Author(s):  
Eric Millon ◽  
Jacques Perrière ◽  
Olivier Albert ◽  
Jean Etchepare ◽  
Chantal Boulmer-Leborgne
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Target Material ◽  
Wide Band ◽  
Laser Pulses ◽  
Growth Conditions ◽  
Laser Deposition ◽  
Time Resolved ◽  
Short Laser Pulses

AbstractThe femtosecond (fs) lasers display noticeable specificities compared with the nanosecond (ns) ones operating in the UV domain, and classically used for the pulsed-laser deposition (PLD) technique. The ultra-short laser pulses offer the feature of minimal thermal damage induced in the target material, and the very high intensities (1012-14 W/cm2) available with fs lasers are likely to allow the ablation of any kind of materials, even the wide band gap insulators.The morphology, structure, composition and properties of the films obtained by fs PLD are studied according to the experimental growth conditions, the nature of the target material, and the dynamic expansion of plasma plume. In the case of ZnO, smooth, dense and nanocrystalline films (10 to 30 nm crystallites) can be epitaxially grown on adequate substrates (i.e. sapphire). On the contrary, BaTiO3 films are formed by the random stacking of aggregates (10 to 200 nm) leading to a non negligible surface roughness,. In addition, the chemical composition of fs PLD thin films of multicomponent compound (i.e. BaTiO3) is not homogeneous, an enrichment in the lighter element being observed in the central part of the film. These properties are related to the phenomena taking place during the various steps of the process (laser-matter interaction, plasma formation, expansion) through time resolved emission spectroscopy and plume optical imaging measurements.

Interaction of ultra-short laser pulses with CIGS and CZTSe thin films

2013 ◽  
Vol 114 (1) ◽  
pp. 231-241 ◽  
Author(s):  
P. Gečys ◽  
E. Markauskas ◽  
J. Dudutis ◽  
G. Račiukaitis
Keyword(s):  
Thin Films ◽  
Laser Pulses ◽  
Short Laser Pulses

Laserannealing studies of barium strontium titanate thin films using short laser pulses

2000 ◽  
Vol 30 (1-4) ◽  
pp. 129-138 ◽  
Author(s):  
O. Baldus ◽  
W. Krasser ◽  
S. Hoffmann ◽  
R. Waser ◽  
E. W. Kreutz
Keyword(s):  
Thin Films ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Laser Pulses ◽  
Barium Strontium ◽  
Short Laser Pulses
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