MICROWAVE DETECTING PROPERTIES OF Tl-BASED HIGH Tc THIN FILM MICROBRIDGES

1992 ◽  
Vol 06 (04) ◽  
pp. 221-225
Author(s):  
S.L. YAN ◽  
H.H. FENG ◽  
L. FANG ◽  
H.L. CAO ◽  
X.M. YANG
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Chemical Etching ◽  
Microwave Frequency ◽  
Liquid Nitrogen Temperature ◽  
Bias Current ◽  
High Tc ◽  
Constant Bias ◽  
Zero Resistance ◽  
Dc Bias

Microwave detecting properties of Tl -based high T c superconducting microbridges have been investigated at liquid nitrogen temperature. The microbridges with the area of about 4×4 μ m 2 were fabricated by photolithographing and chemical etching superconducting Tl 2 Ba 2 Ca 2 Cu 3 O x thin films. Zero resistance temperatures T c (R=0) of the thin films were over 110 K. Detecting sensitivity was influenced heavily by the dc bias current and was reasonably linear function of the incident microwave power at a constant bias current. The sensitivity of 5.5×104 V/W has been obtained at microwave frequency of 9.40 GHz.

THREE-DIMENSIONAL TlBaCaCuO THICK FILM DC SQUID

1993 ◽  
Vol 07 (09) ◽  
pp. 633-639
Author(s):  
YUHUA HUO ◽  
SHOUZHEN ZHAO ◽  
FANGWU SHAO ◽  
CHANGCHUN WEI ◽  
LINGWEN ZENG ◽  
...  
Keyword(s):  
Thin Film ◽  
Critical Current Density ◽  
Thick Film ◽  
Critical Current ◽  
Current Density ◽  
Screen Printing ◽  
Three Dimensional ◽  
Bias Current ◽  
Zero Resistance ◽  
Dc Bias

TlBaCaCuO thick films were fabricated by the method of screen printing. Zero resistance temperature of 110 K–118 K and critical current density of about 102 A/cm 2 at 77 K were obtained. The thickness of the film was about 30 μm. Using the thick film we have fabricated three-dimensional DC SQUID. The flux modulated V–I curve, V–H curve, and triangular patterns in response to flux applied at the different dc bias current were measured. The results showed that not only TlBaCaCuO thick film DC SQUID was like that from TlBaCaCuO thin film in good microwave behaviour but also the processes of fabricating thick film DC SQUID were easy.

scholarly journals Analysis of asymmetric property with DC bias current on thin-film magnetoimpedance element

AIP Advances ◽  
2017 ◽  
Vol 8 (5) ◽  
pp. 056618 ◽  
Author(s):  
Hiroaki Kikuchi ◽  
Chihiro Sumida
Keyword(s):  
Thin Film ◽  
Bias Current ◽  
Dc Bias

Comparison of Several CU(I) and CU(II) Precursors for the Sol-Gel Preparation of High TC Superconducting Metal Oxides

1988 ◽  
Vol 121 ◽  
Author(s):  
Mariquita A. Accibal ◽  
Jonathan W. Draxton ◽  
Allen H. Gabor ◽  
Wayne L. Gladfelter ◽  
Beth Anne Hassler ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Oxides ◽  
Coordination Compounds ◽  
Sol Gel ◽  
High Tc ◽  
Superconducting Metal ◽  
Zero Resistance ◽  
Gel Preparation ◽  
Sol Gel Synthesis

ABSTRACTA comparison of the use of three different coordination compounds of copper as precursors for the sol-gel synthesis of YBa2Cu3O7-δ has been made. For yttrium, the tris(isopropoxide) was used exclusively, while the use of both Ba(O-i-Pr)2 and Ba(OCH2CH2OEt)2 (prepared in situ from Ba metal) as sources for Ba were studied. After dissolving Y(O-i-pr)3, a Ba source, and the copper(I) alkoxide, [Cu(O-i-Bu)]4, hydrolysis led immediately to an orange gelatinous solid which yielded YBa2Cu3O7-δ upon firing in oxygen. Copper(II) acetate was found to give heterogeneous mixtures under our conditions and was not further studied. Copper(II) acac (acac = acetylacetonate) yielded the best results. Partially hydrolyzed solutions of Cu(acac)2, Ba(OCH2CH2OEt)2, and Y(O-i-pr)3 were spin coated on SrTi03 (100) and fired under oxygen to give oriented (b axis normal to the surface) thin films of YBa2Cu3O7-δ. The onset of superconductivity for the films was 92 K, but they did not reach zero resistance until much lower temperatures.

THE DIFFUSION OF THE VORTICES IN HIGH Tc THIN FILM MICROBRIDGES: MODEL AND RESULTS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3626-3634
Author(s):  
P. BERNSTEIN ◽  
M. PANNETIER ◽  
Ph. LECOEUR ◽  
T. D. DOAN ◽  
J. F. HAMET
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Vortex Motion ◽  
Bias Current ◽  
Vortex Pinning ◽  
Superconducting Thin Film ◽  
High Tc ◽  
Current Flows ◽  
Creep Regime ◽  
Physical Quantities

We have previously proposed a model for the flux creep regime of the vortices in superconducting thin film microbridges in which a bias current flows. In the first part of the paper this model is summarized and we show how physical quantities which are relevant to estimate the importance of vortex pinning in the samples can be determined. Then, the effect of a low applied magnetic field on the modulation of the critical current of the microbridges is discussed and we show how this type of measurements can give additionnal information on the vortex motion in the samples and allows to determine their superconducting thickness and penetration depth as a function of temperature.

HIGH Tc SUPERCONDUCTING THIN FILMS BY CHEMICAL SPRAY DEPOSITION

1987 ◽  
Vol 01 (02) ◽  
pp. 579-582
Author(s):  
Guang-yao Meng ◽  
Xian-dong Wang ◽  
Xue-jun Chen ◽  
Pei-zhen Fu ◽  
Pinghua Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Spray Deposition ◽  
Nitrate Solution ◽  
Deposition Process ◽  
Superconducting Thin Films ◽  
High Tc ◽  
Chemical Spray ◽  
Zero Resistance ◽  
Super Conducting ◽  
Deposition Conditions

A Chemical spray deposition process with mixed nitrate solution as source was developed to prepare thin films of Ba-Y-Cu oxide on sapphire substrate. By adjusting the source composition and deposition conditions, we have successfully obtained the films in thickness of 2–15μm with essentially orthorhombic Ba2YCu3O7 phase. The films behave super conducting transition with onset above 90K and zero resistance at 68.4K to date. It is believed that the tails in the resistance transition can be improved by searching proper heat treatment and using suitable substrates such as ZrO2 and SrTiO3.

Effects of DC Bias Current on Behavior and Sensitivity of Thin-Film Magnetoimpedance Element

2017 ◽  
Vol 53 (11) ◽  
pp. 1-4 ◽  
Author(s):  
H. Kikuchi ◽  
C. Sumida ◽  
T. Nakai ◽  
S. Hashi ◽  
K. Ishiyama
Keyword(s):  
Thin Film ◽  
Bias Current ◽  
Dc Bias

Fabrication of Helically Perforated Thin Films

2000 ◽  
Vol 636 ◽  
Author(s):  
K.D. Harris ◽  
K.L. Westra ◽  
M.J. Brett
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Chemical Etching ◽  
Glancing Angle Deposition ◽  
Glass Substrates ◽  
Small Pitch ◽  
Glancing Angle ◽  
Angle Deposition ◽  
Template Material

AbstractUsing glancing angle deposition and templating techniques, we have fabricated a number of unique thin film microstructures. Engineered columnar thin films having the inverse of the desired structure (i.e., arrays of helices or chevrons) were first deposited by glancing angle deposition. These films were then filled with a solution of the desired material, and allowed to cure. The template material was then removed by chemical etching, leaving a perforated thin film. Such films have been produced of photoresist and spin-on-glass, on both silicon and glass substrates. The perforations have taken the form of chevrons and helices of large and small pitch, and have been arranged in both random and periodic (1μm spacing) arrays.

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