Vortex motion modulated by a self field in a large Josephson junction

Author

Enpuku, Keiji ; Yoshida, Keiji ; Irie, Fujio ; Hamasaki, Katsuyoshi

Author_Institution

Kyushu University, Fukuoka, Japan

Volume

27

Issue

10

fYear

1980

fDate

10/1/1980 12:00:00 AM

Firstpage

1973

Lastpage

1978

Abstract

Motion of a vortex array (flux flow) in a large Josephson junction is studied both theoretically and experimentally. An expression for dc current-voltage ( $I-V$ ) characteristics of a large junction in a flux-flow state, which is caused by the external dc magnetic field and current, is obtained by taking account of the self field due to the dc current through the junction as well as the large loss due to the surface resistance of junction electrodes. It is shown that the spacially uniform flux flow is crucially modulated by the self field in a high-velocity region of the flux flow. As a result, the magnitude of the current peak in $I-V$ curves decreases significantly and saturates with respect to both the length and the quality factor of the junction, which is confirmed by experiments with large Pb-PbxOy-Pb junctions.

Keywords

Computer simulation; Difference equations; Electric resistance; Electrodes; Josephson junctions; Magnetic fields; Magnetic modulators; Q factor; Surface resistance; Voltage;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/T-ED.1980.20134

Filename

1480927