COMPUTER-SIMULATIONS OF DYNAMICS OF VORTEX LINES IN SUPERCONDUCTING FLUX-FLOW TRANSISTORS

被引：3

作者：

ANDOH, H ^{[1
]}

KUSUNOKI, M ^{[1
]}

FUJIMAKI, A ^{[1
]}

HAYAKAWA, H ^{[1
]}

机构：

[1] NAGOYA UNIV,DEPT ELECTR ENGN,CHIKUSA KU,NAGOYA,AICHI 46401,JAPAN

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

关键词：

Calculations - Computer simulation - Dynamics - Electric currents - Equations of motion - Josephson junction devices - Magnetic field effects - Transistors - Yttrium compounds;

D O I：

10.1109/77.403316

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We study the dynamics of vortex lines in superconducting flux flow transistors (SFFT's) made of High T-c superconductors, YBa2Cu3Ox. By computer simulations we have found that the density of vortex lines in SFFT's has close relation to device I-V characteristics rather than the velocity of vortex lines and that we have to increase the density of vortex lines to get ones with available gain. To be more concrete, in order to increase the density of vortex lines we have to lower surface barriers at the edge of weak-links and heighten the magnetic field near the edge of weak links. Especially, it is very important to heighten the magnetic field at the both sides of a link in a SFFT. Under the control of the control current, vortex lines in a SFFT are driven by the transport current (the bias current) mainly, but it is important to think the other forces such as the force by screening current, the force induced by the other vortices and the force induced by the image vortices. Based on the local stochastic equation of motion for vortex lines, computer simulations for some conditions are performed to discuss the dynamic behavior of vortex lines in a SFFT. We report the effect of the external magnetic field induced by the control current on the motion of vortex lines in SFFT's.

引用

页码：3377 / 3380

页数：4

共 7 条

[1]

Martens J.S., Ginley D.S., Beyer J.B., Nordman J.E., Hohenwarter G.K.G., A model equivalent circuit for a superconducting flux flow transistor, IEEE Trans. Appl. Superconduct, 1, pp. 95-101, (1991)

[2]

Miyahara K., Kubo S., Suzuki M., Vortex flow characteristics of high-Tc flux flow transistors, J.Appl.Phys., 75, 1, (1994)

[3]

Orlando T.P., Dissertation submitted to the department of physics and committed on graduate studies of Stanford University

[4]

Lee L.H., Orlando T.P., Lyons W.G., Current Distribution in Superconducting Thin-Film Strips, IEEE Trans. Appl. Super-conduct, 1, pp. 41-44, (1994)

[5]

Van Duzer T., Turner C.W., Principles of Superconductive Devices and Circuits, (1981)

[6]

Rhoderick E.H., Wilson E.M., Current Distribution in Thin Superconducting Films, NATURE, 194, pp. 1167-1168, (1962)

[7]

Pearl J., Current Distribution in Superconducting Films Carrying Quantized Fluxoids, Appl.Phys.Lett., 5, 4, pp. 65-66, (1964)

← 1 →