73 Result(s)
within
X. X. **e
Nanotechnology
-
Article
Ion Beam Modification of High-Tc Superconductors
Ion irradiation and implantation experiments of high temperature superconductors (HTSC) thin films resulted in many interesting effects. Among those are: (i) the superlinear increase of the resistivity, p, wit...
-
Article
High Critical Current Density in Ultrathin Ybco Films
Measurements of the critical current density Jc for ultrathin YBa2Cu307-X (YBCO) films are presented.A high Jc value at 77K in zero field of 2xl06A/cm2 was obtained in a 30nm thick film and even a 5nm thick film ...
-
Article
Fabrication of Yy-Pr1-y -Ba-Cu-O Thin Films and Superlattices of -Ba-Cu-O/Yy-Pr1-y -Ba-Cu-O
We have prepared epitaxial thin films of Yy-Pr1-y-Ba-Cu-O (y= 1 to 0) and superlattices of Y-Ba-Cu-O/Yy-Pr1-y -Ba-Cu-O using pulsed laser deposition technique. The zero resistance transition temperatures of Yy-Pr
-
Article
High Rate Growth of YBa2Cu3O7-x Thin Films using Pulsed Excimer Laser Deposition
We report here on the pulsed laser deposition of high quality, superconducting, 200 nm thick films of YBa2Cu3O7-x at rates approaching 15 nm/s. Film crystallinity and electrical properties were studied as a funct...
-
Article
Laser Deposition of High Tc Superconducting thin Films: Present and Future
Pulsed laser deposition (PLD) has been widely used for deposition of high Tc superconducting thin films, and is recognized as one of the best physical vapor techniques for the preparation of these films. The most...
-
Article
The atomic structure of growth interfaces in Y–Ba–Cu–O thin films
We have examined the atomic structure of growth interfaces in thin films of Y–Ba–Cu–O grown on [001] perovskite or cubic substrates. At substrate heater temperatures in the range of 780–820 °C c-axis oriented ...
-
Article
Effect of substrate materials on laser deposited Nd1.85Ce0.15CuO4−y films
The growth morphology and interface structure of Nd1.85Ce0.15CuO4−y (NCCO) films grown by pulsed laser deposition on two different types of substrates, “perovskite” LaAlO3 (LAO) and SrTiO3 (STO) and “fluorite” Y2
-
Article
Study of Amorphous Silicon Nitride films by Brillouin Spectroscopy
The elastic properties of hydrogenated silicon nitride (a-SiNx:H) films, with x=1, have been investigated by means of the Brillouin light scattering technique. The films were deposited on an opaque substrate (sil...
-
Article
Microwave Sintering of Zirconia Toughened Mullite (ZTM)
Microwave sintering of zirconia toughened mullite (ZTM) has been performed in a single mode applicator. In comparison with conventional sintering, microwave processing of ZTM leads to a higher density and fine...
-
Article
NTO Decomposition Studies
To examine the thermal decomposition of 5-nitro-2,4-dihydro-3H-1,2,4-triazol-3-one (NTO) in detail, isotopic labeling studies were undertaken. NTO samples labeled with 15N in three different locations [N(1) and N...
-
Article
Dielectric Properties of Pulsed Laser Deposited SrTiO3 Thin Films
Low frequency dielectric loss and nonlinearity in pulsed laser deposited SrTiO3 thin films were studied. A low loss tangent in the order of 10−4, close to the level found in SrTiO3 single crystals, was observed. ...
-
Article
Macroscopic Probing of the Joint Between Metals in Mr Heads
During the wafer manufacturing process of magnetoresistive (MR) heads which are widely used in Hard Disk Drives, the metal leads are deposited on both sides of the MR sensing element through the photoresist ma...
-
Article
In Situ Studies of the Vibrational and Electronic Properties of Si Nanoparticles
We report onin situ studies of the vibrational properties of ultra-thin Si layers grown by dc magnetron sputtering in ultrahigh vacuum on amorphous MgO and Ag buffer layers. The average thickness of the Si layers...
-
Article
GMR Effect and Properties of CoAg Granular Films Formed by Implantation with a Metal Vapor Vacuum Arc Ion Source
Cobalt-silver granular thin films were formed by Co implantation into Ag using a metal vapor vacuum arc (MEVVA) ion source. The magnetic field dependence and the temperature variation of the giant magnetoresis...
-
Article
Dielectric Properties of Bi2Ti2O7 Thin Films with (111) Orientation
Bismuth titanate thin films have been prepared on silicon by metalorganic decomposition□MOD) technique with bismuth nitrate and titanium butoxide as source materials. The growth procedure of the Bi2Ti2O7 thin fil...
-
Article
Interface Properties Between SrTiO3 Thin Films and Electrodes
SrTiO3 (STO) thin films were grown by pulsed laser deposition on single crystal STO substrates with a SrRuO3 buffer layer, which also serves as a bottom electrode. Measurements of the low frequency dielectric pro...
-
Article
Soft-Mode Phonons in SrTiO3 Thin Films Studied by Far-Infrared Ellipsometry and Raman Scattering
We report the experimental studies of the vibrational spectra of SrTiO3 films with the thickness of 1 ώm grown by pulsed laser deposition. Fourier-transform infrared ellipsometry between 30 and 700 cm−1 and elect...
-
Article
Oxidation Kinetics in SrTiO3 Homoepitaxy
Using an oblique-incidence optical reflectivity difference technique, we investigated kinetic processes in SrTiO3 homoepitaxy on SrTiO3(001) under pulsed laser deposition conditions. Depending upon growth tempera...
-
Article
Superparamagnetic Behavior of Granular Co-C Films Consisting of Nanocrystalline Cobalt Encapsulated in Carbon
Nanocomposite Co-C thin films of about 15 nm thick were prepared by pulsed filtered vacuum arc deposition. The films were characterized by x-ray photoelectron spectroscopy, non-Rutherford backscattering spectr...
-
Article
Microstructure and misfit relaxation in SrTiO3/SrRuO3 bilayer films on LaAlO3(100) substrates
We studied the microstructure of SrTiO3/SrRuO3 bilayer films on (001) LaAlO3 substrates by high-resolution transmission electron microscopy. At the SrRuO3/LaAlO3 interface a defect configuration of stacking fault...
