Effect of external magnetic field on fluxon dynamics and current voltage characteristics of long Josephson junctions

Journal Article · Sun May 01 00:00:00 EDT 1983 · IEEE Trans. Magn.; (United States)

DOI:https://doi.org/10.1109/TMAG.1983.1062443· OSTI ID:5747272

Radparvar, M; Nordman, J

The presence of zero field steps (ZFS) on the voltampere characteristics of long Josephson junctions has been generally accepted as a manifestation of fluxon propagation. Each step represents an equal number of fluxons and antifluxons resonating in the junction in a period fixed by the junction length. However, extra steps have been experimentally observed which appear to correspond to non-integral numbers of fluxons traversing the junction in one period. The authors use a computer simulation of the sine-Gordon equation and a separate mechanical model to demonstrate that it is feasible to maintain a different number of fluxons and antifluxons in the junction within one period. With the appropriate choice of asymmetric boundary conditions corresponding to an applied magnetic field, one end of the junction, upon arrival of an antifluxon, may release one or more extra fluxons, while the opposite end is capable of absorbing these extra fluxons. Thus, the number of fluxons passing through a given point in the junction is not equal to the number of antifluxons passing the same point within a period. If the difference between the number of fluxons and antifluxons is an odd number, steps in addition to ZFS appear on the volt-ampere characteristic. The authors demonstrate that a variety of complex step behavior in magnetic fields can be explained by using the concept of creation and annihilation of fluxons at the boundaries.

• Research Organization: Dept. of Electrical and Computer Engineering, Univ. of Wisconsin, Madison, WI 53706
• OSTI ID: 5747272
• Journal Information: IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 19:3; ISSN IEMGA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOUNDARY CONDITIONS
COMPUTERIZED SIMULATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EQUATIONS
FIELD EQUATIONS
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FIELDS
MAGNETIC FLUX
PHYSICAL PROPERTIES
RESONANCE
SIMULATION
SINE-GORDON EQUATION
SUPERCONDUCTING JUNCTIONS