Annihilation of vortex-antivortex pairs in a superconducting shield

Thesis/Dissertation · Tue Dec 31 23:00:00 EST 1985

OSTI ID:5415930

Fang, M M

A new type of magnetic shielding device was constructed for use in superconducting microelectronic applications where low ambient magnetic field is desirable. The shield was a specially designed superconducting thin film in the shape of a long cylindrical tube with a low pinning material in the central region and high flux pinning regions at the end. It was shown that magnetic flux perpendicular to the axis of a cylinder could be swept out of the interior of the shield by moving vortex-antivortex pairs to one side of the shield where they annihilate. The flux-sweeping properties of the shield were found to work well in a small-temperature window close to the transition temperature where the critical current for depinning vortices was less than the critical current for the formation of hot spots. Once the vortices are swept out, the shield can be cooled to enhance the Meissner shielding effects against other stray fields. In the course of designing and testing the shield, a systematic study of flux pinning was made for the low magnetic field regime between 1 mOe and 30 Oe.

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5415930
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420201* -- Engineering-- Cryogenic Equipment & Devices
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNIHILATION
BASIC INTERACTIONS
CONFIGURATION
CRITICAL CURRENT
CURRENTS
CYLINDRICAL CONFIGURATION
ELECTRIC CURRENTS
ELECTROMAGNETIC INTERACTIONS
FILMS
INTERACTIONS
MAGNETIC FLUX
MAGNETIC SHIELDING
MICROELECTRONICS
PHYSICAL PROPERTIES
SHIELDING
SUPERCONDUCTING FILMS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VORTICES