scholarly journals nanoSQUID operation using kinetic rather than magnetic induction

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Adam N. McCaughan ◽  
Qingyuan Zhao ◽  
Karl K. Berggren
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Applied Magnetic Field ◽  
Magnetic Induction ◽  
Quantization Condition ◽  
Kinetic Inductance ◽  
Superconducting Thin Films ◽  
Magnetic Inductance ◽  
Measurement Results ◽  
Superconducting Loop

Abstract We report on a method of nanoSQUID modulation which uses kinetic inductance rather than magnetic inductance to manip-ulate the internal fluxoid state. We produced modulation using injected current rather than an applied magnetic field. Using this injected current, we were able to observe the triangle-wave shaped modulation of the device critical current which was periodic according to the London fluxoid quantization condition. The measurement results also confirmed that the fluxoid state inside a superconducting loop can be manipulated using primarily kinetic inductance. By using primarily kinetic inductance rather than magnetic inductance, the size of the coupling inductor was reduced by a factor of 10. As a result, this approach may provide a means to reduce the size of SQUID-based superconducting electronics. Additionally, this method provides a convenient way to perform kinetic inductance characterizations of superconducting thin films.

ANOMALOUS BEHAVIORS OF NON-RESONANT MICROWAVE ABSORPTIONS OF SUPERCONDUCTORS

2000 ◽  
Vol 14 (16) ◽  
pp. 1633-1650
Author(s):  
K. SUGAWARA ◽  
N. ARAI ◽  
A. KOUZUKI ◽  
S. ICHIMURA ◽  
H. NAOI ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Applied Magnetic Field ◽  
Microwave Power ◽  
Superconducting Thin Films ◽  
Modulation Amplitude ◽  
Directional Effect ◽  
System A ◽  
Powder Samples ◽  
Preliminary Study

The non-resonant microwave absorption (NRMA) measurements have been intensively performed for superconducting thin films of YBa 2 Cu 3 O y fabricated on MgO (100) substrates and powder samples of LaSrCuO systems. In order to complement the study, we also review the NRMA of BiSrCaCuO system. A particular attention has been paid to the following phenomena: (i) phases, (ii) effect of current, (iii) directional effect of applied magnetic field, (iv) hysteresis, (v) microwave power absorbed as a function of magnetic field, (vi) linewidth in the vicinity of T c , and (vii) modulation amplitude effect. A preliminary study on ( La 0.98 Dy 0.02)1.85 Sr 0.15 CuO 4 was also reported.

scholarly journals Ammonia Synthesis Using Magnetically Induced Reaction

2013 ◽  
Vol 334-335 ◽  
pp. 329-336 ◽  
Author(s):  
Noorhana Yahya ◽  
Poppy Puspitasari ◽  
Nor Hasifah Noordin
Keyword(s):  
Magnetic Field ◽  
Catalytic Activity ◽  
Applied Magnetic Field ◽  
Magnetic Induction ◽  
Ammonia Synthesis ◽  
High Energy ◽  
Ammonia Production ◽  
Desorption Process ◽  
Capital Intensive ◽  
Micro Reactor

Ammonia production is a high energy and capital intensive industry as it requires high temperature (400500°C) and high pressure (150300 bar) for its daily operations. By introducing nanocatalyst with the new concept of micro-reactor with applied magnetic field induction, the catalytic activity can be induced and the output can be enhanced. Magneto-dynamics will be introduced in the ammonia production process in order to replace the concept of thermodynamics in the Haber Bosch process. The nanocatalysts (Y3Fe5O12, Fe2O3, MnO, Mn0.8Zn0.2Fe2O4) have been reduced by using the temperature reduction method (TPR). The Y3Fe5O12(YIG) catalyst with magnetic induction produced242.56µmol/h.g-cat output of ammonia which is 2% much higher than ammonia synthesis without magnetic induction (237.52 µmol/g.h).The ammonia output based on the magnetic induction method at a temperature of 0°C is 242.56µmole/h.g-cat which is 0.90% higher than the synthesis at 25°C temperature (240.4 µmol/g.h). The ammonia output at 0.2Tesla is 249.04 µmole/h.g-cat which is higher 2.6% than the output at 0.1Tesla which is 242.56µmol/g.h. It is proven that the higher the applied magnetic field is, the more effective the catalytic activity will be as a better alignment of the electron spin of the catalyst occurs and enhances the adsorption and desorption process. Y3Fe5O12(YIG) shows the best catalytic reaction followed by Fe2O3(hematite) and MnO (manganese oxide). By this new route, synthesis of ammonia at low temperature is realized and offers ammonia producers an economic advantage compared to the classical routes.

scholarly journals Preparation of Bi-based Superconducting Thin Films by RF Magnetron Sputtering under Magnetic Field

Shinku ◽  
2004 ◽  
Vol 47 (3) ◽  
pp. 194-196
Author(s):  
Naoki FUJIWARA ◽  
Takahiro ONISHI ◽  
Kouji KATSURAHARA ◽  
Satoru KISHIDA
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Magnetron Sputtering ◽  
Rf Magnetron Sputtering ◽  
Superconducting Thin Films

scholarly journals Nonlinear Properties of Supercurrent-Carrying Single- and Multi-Layer Thin-Film Superconductors

2020 ◽  
Vol 199 (1-2) ◽  
pp. 34-44 ◽  
Author(s):  
Songyuan Zhao ◽  
S. Withington ◽  
D. J. Goldie ◽  
C. N. Thomas
Keyword(s):  
Thin Films ◽  
Complex Surface ◽  
Travelling Wave ◽  
Kinetic Inductance Detectors ◽  
Order Effects ◽  
Kinetic Inductance ◽  
Superconducting Thin Films ◽  
Superconducting Transition ◽  
Nonlinear Properties ◽  
Wide Range

AbstractSuperconducting thin films are central to the operation of many kinds of quantum sensors and quantum computing devices: kinetic inductance detectors (KIDs), travelling-wave parametric amplifiers (TWPAs), qubits, and spin-based quantum memory elements. In all cases, the nonlinearity resulting from the supercurrent is a critical aspect of behaviour, either because it is central to the operation of the device (TWPA), or because it results in nonideal second-order effects (KID). Here, we present an analysis of supercurrent-carrying superconducting thin films that is based on the generalized Usadel equations. Our analysis framework is suitable for both homogeneous and multi-layer thin films, and can be used to calculate the resulting density of states, superconducting transition temperature, superconducting critical current, complex conductivities, complex surface impedances, transmission line propagation constants, and nonlinear kinetic inductances in the presence of supercurrent. Our analysis gives the scale of kinetic inductance nonlinearity ($$I_*$$I∗) for a given material combination and geometry, and is important in optimizing the design of detectors and amplifiers in terms of materials, geometries, and dimensions. To investigate the validity of our analysis across a wide range of supercurrent, we have measured the transition temperatures of superconducting thin films as a function of DC supercurrent. These measurements show good agreement with our theoretical predictions in the experimentally relevant range of current values.

Upper Critical Field and Irreversibility Line in Bi2Sr2CuO6+δ/CaCuO2 Superconducting Superlattices Obtained by MBE

2000 ◽  
Vol 14 (25n27) ◽  
pp. 2767-2772
Author(s):  
Matteo Salvato ◽  
Carmine Attanasio ◽  
Gerardina Carbone ◽  
Rosalba Fittipaldi ◽  
Tiziana Di Luccio ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Thin Films ◽  
Phase Diagrams ◽  
Applied Magnetic Field ◽  
Three Dimensional ◽  
Upper Critical Field ◽  
Resistivity Measurements ◽  
T Phase ◽  
The Magnetic Field

Resistivity measurements in external applied magnetic field up to 8.5T have been performed on Bi2Sr2CuO6+δ/CaCuO2 superconducting superlattices obtained by MBE. The magnetic field (H) vs. temperature (T) phase diagrams have been determined and the experimental data have been compared with that obtained in the case of Bi2Sr2CuO6+δ thin films deposited with the same technique. A reduction of the anisotropy has been obtained in the case of the superlattices with respect to the case of Bi2Sr2CuO6+δ thin films and a three dimensional behavior has been observed by paraconductivity measurements.

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