Imprint of La-Sr-Co-O/Pb-La-Zr-Ti-O/La-Sr-Co-O Heterostructures Grown by Pulsed Laser Deposition

1994 ◽  
Vol 361 ◽  
Author(s):  
J. Lee ◽  
R. Ramesh ◽  
V.G. Keramidas
Keyword(s):  
Pulsed Laser Deposition ◽  
Bismuth Titanate ◽  
Polarization State ◽  
Pulsed Laser ◽  
Hysteresis Loops ◽  
Pronounced Effect ◽  
The Other ◽  
Laser Deposition ◽  
Switching Behavior ◽  
Crystalline Quality

ABSTRACTLa-Sr-Co-O(LSCO)/Pb-La-Zr-Ti-O(PLZT)/La-Sr-Co-O heterostructures with different crystalline quality have been grown on LaAlO3 and Si with a bismuth titanate template layer. Imprint of the heterostructures are investigated in comparison with fatigue and retention. Oxygen ambient during cooling the heterostructures was also varied to investigate the imprint. With consideration of the switching behavior caused by imprint, imprint behavior was deconvoluted from fatigue and retention. In epitaxial PLZT capacitors grown on LaAlO3, imprint behavior was found to be significantly dependent on the oxygen ambient. As the oxygen ambient became more reducing, the capacitors developed more voltage asymmetry in hysteresis loops and a more preferred polarization state directed towards the top electrode. On the other hand, oriented PLZT capacitors exhibited less pronounced effect of the oxygen ambient on the imprint behavior.

Microstructure of Compositionally Graded PZT films Grown by Pulsed Laser Deposition

2008 ◽  
Vol 14 (S3) ◽  
pp. 53-56
Author(s):  
S.A.S. Rodrigues ◽  
A. Khodorov ◽  
M. Pereira ◽  
M.J.M. Gomes
Keyword(s):  
Pulsed Laser Deposition ◽  
Lead Zirconate Titanate ◽  
Film Growth ◽  
Pulsed Laser ◽  
Hysteresis Loops ◽  
Lead Zirconate ◽  
Laser Deposition ◽  
Composition Gradient ◽  
Complex Structures ◽  
Pzt Films

Ferroelectric films with a composition gradient have attracted much attention because of their large polarization offset present in the hysteresis loops. Lead Zirconate Titanate (PZT) films were deposited on Pt/TiO2/SiO2/Si substrates by Pulsed Laser Deposition (PLD) technique, using a Nd:YAG laser (Surelite) with a source pulse wavelength of 1064 nm and duration of 5-7 ns delivering an energy of 320 mJ per pulse and a laser fluence energy about 20 J/cm2. The film growth is performed in O2 atmosphere (0,40 mbar) while the substrate is heated at 600°C by a quartz lamp. Starting from ceramic targets based on PZT compositions and containing 5% mol. of excess of PbO to compensate the lead evaporation during heat treatment, three films with different compositions Zr/Ti 55/45, 65/35 and 92/8, and two types of complex structures were produced. These complex structures are in the case of the up-graded structure (UpG), with PZT (92/8) at the bottom, PZT (65/35) on middle and PZT (55/45) on the top, and for down-graded (DoG) one, that order is reversed.

High crystalline quality ZnSe films grown by pulsed laser deposition

1995 ◽  
Vol 67 (10) ◽  
pp. 1390-1392 ◽  
Author(s):  
M. Y. Chern ◽  
H. M. Lin ◽  
C. C. Fang ◽  
J. C. Fan ◽  
Y. F. Chen
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Crystalline Quality ◽  
High Crystalline Quality

Crystalline quality of ZnSe thin films grown on GaAs by pulsed laser deposition in He and Ar ambients

2001 ◽  
Vol 388 (1-2) ◽  
pp. 189-194 ◽  
Author(s):  
Tapas Ganguli ◽  
M. Vedvyas ◽  
P. Bhattacharya ◽  
L.M. Kukreja ◽  
Alka Ingale ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Crystalline Quality ◽  
Znse Thin Films

THE TARGET MORPHOLOGY DURING PULSED LASER DEPOSITION OF HYDROXYAPATITE THIN FILMS

2005 ◽  
Vol 12 (04) ◽  
pp. 539-543 ◽  
Author(s):  
QUANHE BAO ◽  
CHUANZHONG CHEN ◽  
LUBIN CHEN ◽  
DIANGANG WANG ◽  
TINGQUAN LEI ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
The Other ◽  
Laser Deposition ◽  
Grain Structure ◽  
Before And After ◽  
Modified Surface ◽  
Modified Surface Layer

A modified surface layer of hydroxyapatite (HA) target was observed before and after pulsed laser deposition. Two types of HA targets were used for laser ablation. We observed that the surface morphology of the target has a very fine compacted grain structure and presents many irregularities with some microroughness and microporosity before laser ablation. The laser ablated regions can be divided into two areas: one area is porous and rough but the other is dense and smooth. The percentage of particles in the films was high for the films produced with targets that were sintered at 1200°C.

Pulsed Laser Deposition of SrBi2Ta2O9 Thin Films for Nonvolatile Memory Applications

1995 ◽  
Vol 397 ◽  
Author(s):  
S. Werner ◽  
D. Thomas ◽  
S.K. Streiffer ◽  
O. Auciello ◽  
Angus I. Kingon
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Nonvolatile Memory ◽  
Elevated Temperatures ◽  
Sol Gel ◽  
Pulsed Laser ◽  
Hysteresis Loops ◽  
Laser Deposition ◽  
Polarization Electric Field ◽  
Memory Applications

ABSTRACTFerroelectric SrBi2Ta2U9 (SBT) thin films were synthesized by pulsed laser deposition (PLD) on platinized silicon substrates held at different substrate temperatures, from targets with different compositions. It was necessary to anneal films deposited at low temperature (525°C) at elevated temperatures in an oxygen atmosphere in order to achieve properties comparable to SBT thin films grown by the sol-gel technique. Polarization – electric field hysteresis loops showed saturation in the 2-5 V range with a remnant polarization 2Pr = 8-13 µC/cm2. Capacitors showed negligible fatigue up to 1010 switching cycles.

Comparison of lanthanum substituted bismuth titanate (BLT) thin films deposited by sputtering and pulsed laser deposition

2006 ◽  
Vol 495 (1-2) ◽  
pp. 86-91 ◽  
Author(s):  
M.P. Besland ◽  
H. Djani-ait Aissa ◽  
P.R.J. Barroy ◽  
S. Lafane ◽  
P.Y. Tessier ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Bismuth Titanate ◽  
Pulsed Laser ◽  
Laser Deposition

Non-Stoichiometric Transfer of Complex Oxides by Pulsed Laser Deposition at Low Fluences

1995 ◽  
Vol 397 ◽  
Author(s):  
B. Dam ◽  
J.H. Rector ◽  
J. Johansson ◽  
DG. DE Groot ◽  
R. Griessen
Keyword(s):  
Phase Separation ◽  
Pulsed Laser Deposition ◽  
Volume Diffusion ◽  
Pulsed Laser ◽  
Target Surface ◽  
Complex Oxides ◽  
The Other ◽  
Laser Deposition ◽  
Other Hand

ABSTRACTWe provide evidence that non-stoichiometric ablation of YBa2Cu3O7δ at low fluences is due to a phase separation of the target surface. On the other hand, in SrTiO3 we find at low fluences evidence for preferential ablation which is assisted by volume-diffusion. As a result, the Sr/Ti ratio of the ablated films can be tuned by choosing the appropriate fluence.

Pulsed laser deposition (PLD) of oriented bismuth titanate films for integrated electronic applications

1992 ◽  
Vol 1 (2-4) ◽  
pp. 213-222 ◽  
Author(s):  
H. Buhay ◽  
S. Sinharoy ◽  
M. H. Francombe ◽  
W. H. Kasner ◽  
J. Talvacchio ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Bismuth Titanate ◽  
Pulsed Laser ◽  
Laser Deposition
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