Magnetic behavior of both superconducting thin films and their deposition targets

1988 ◽  
Vol 63 (8) ◽  
pp. 4199-4201 ◽  
Author(s):  
K. Moorjani ◽  
J. Bohandy ◽  
F. J. Adrian ◽  
B. F. Kim ◽  
U. Atzmony ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Behavior ◽  
Superconducting Thin Films

MAGNETIC BEHAVIOR OF MAGNESIUM DIBORIDE SUPERCONDUCTING THIN FILMS

2003 ◽  
Vol 17 (04n06) ◽  
pp. 597-601
Author(s):  
G. GRIMALDI ◽  
U. GAMBARDELLA ◽  
S. PACE ◽  
V. FERRANDOM ◽  
C. FERDEGHINI ◽  
...  
Keyword(s):  
Thin Films ◽  
Hysteresis Loops ◽  
Annealing Treatment ◽  
Magnetic Behavior ◽  
Anomalous Behavior ◽  
Zero Field ◽  
Superconducting Thin Films ◽  
Double Peak ◽  
Transverse Geometry ◽  
Field Approaches

We report the experimental results of the field H and temperature T dependent magnetization M measurements of MgB 2 superconducting thin films deposited by pulsed laser deposition. MgB 2 thin films were obtained from a precursor layer deposited in UHV at room temperaure from stoichiometric target, then an annealing treatment in Mg atmosphere allowed to crystallize the superconducting phase. From the hysteresis loops at each temperature of measurement the critical current density Jc(H) has been extracted according to Brandt's model for a transverse geometry. At low temperatures an anomalous behavior has been observed in the hysteresis loops: as the exernal magnetic field approaches the zero field region on the upper and lower branches, a double peak of the magnetization occurs. This magnetic flux jumping can be explained within an adiabatic critical state model, and can be ascribed to thermomagnetic instabilities as in bulk samples.

scholarly journals Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3360
Author(s):  
Yakir Dahan ◽  
Eldad Holdengreber ◽  
Elichai Glassner ◽  
Oz Sorkin ◽  
Shmuel E. Schacham ◽  
...  
Keyword(s):  
Thin Films ◽  
Theoretical Model ◽  
Quality Factor ◽  
High Frequency ◽  
Unit Length ◽  
Superconducting Thin Films ◽  
Electrical Parameters ◽  
Very High Frequency ◽  
Production Constraints ◽  
Very High

A new measurement technique of electrical parameters of superconducting thin films at the Very High Frequency (VHF) range is described, based on resonators with microstrip (MS) structures. The design of an optimal resonator was achieved, based on a thorough theoretical analysis, which is required for derivation of the exact configuration of the MS. A theoretical model is presented, from which an expression for the attenuation of a MS line can be derived. Accordingly, simulations were performed, and an optimal resonator for the VHF range was designed and implemented. Production constraints of YBa2Cu3O7 (YBCO) limited the diameter of the sapphire substrate to 3″. Therefore, a meander configuration was formed to fit the long λ/4 MS line on the wafer. By measuring the complex input reflection coefficients of a λ/4 resonator, we extracted the quality factor, which is mainly affected by the dielectric and conductor attenuations. The experimental results are well fitted by the theoretical model. The dielectric attenuation was calculated using the quasi-static analysis of the MS line. An identical copper resonator was produced and measured to compare the properties of the YBCO resonator in reference to the copper one. A quality factor of ~6·105 was calculated for the YBCO resonator, three orders of magnitude larger than that of the copper resonator. The attenuation per unit length of the YBCO layer was smaller by more than five orders of magnitude than that of the copper.

Transverse rectification in superconducting thin films with arrays of asymmetric defects

2007 ◽  
Vol 91 (6) ◽  
pp. 062505 ◽  
Author(s):  
E. M. Gonzalez ◽  
N. O. Nunez ◽  
J. V. Anguita ◽  
J. L. Vicent
Keyword(s):  
Thin Films ◽  
Superconducting Thin Films

Substrate bias effects during R-F sputtering of Y-Ba-Cu-O films

1990 ◽  
Vol 5 (4) ◽  
pp. 677-679 ◽  
Author(s):  
A. J. Drehman ◽  
M. W. Dumais
Keyword(s):  
Thin Films ◽  
Strontium Titanate ◽  
Reactive Sputtering ◽  
Negative Bias ◽  
Superconducting Thin Films ◽  
Substrate Bias ◽  
Composition Control ◽  
Zero Resistance

Y-Ba-Cu-O films were made by R-F diode sputtering using a single oxide target. It was found that if a small negative bias is applied to the substrate, the etching associated with reactive sputtering is significantly reduced. This results in better composition control and uniformity, which are quite important for the formation of superconducting thin films. Films deposited on strontium titanate, when annealed in oxygen, become superconducting with zero resistance at 89 K.

Laser ablation of YBCO targets and optical-breakdown-assisted PLD for high T c superconducting thin films deposition

1998 ◽  
Author(s):  
Ileana Apostol ◽  
Razvan Stoian ◽  
C. Luculescu ◽  
Razvan V. Dabu ◽  
Aurel Stratan ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Optical Breakdown ◽  
Superconducting Thin Films

Microwave Fabry-Pérot Transmission through YBaCuO Superconducting Thin Films

1995 ◽  
Vol 75 (21) ◽  
pp. 3934-3937 ◽  
Author(s):  
H. E. Porţeanu ◽  
K. Karraï ◽  
R. Seifert ◽  
F. Koch ◽  
P. Berberich ◽  
...  
Keyword(s):  
Thin Films ◽  
Superconducting Thin Films ◽  
Fabry Perot
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