Annihilation of vortex-antivortex pairs in a superconducting shield
A new type of magnetic shielding device has been 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:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6356474
- Report Number(s):
- IS-T-1276; ON: DE87010921
- Resource Relation:
- Other Information: Thesis. Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Flux annihilation in superconducting tubes
Instability of flux flow and production of vortex-antivortex pairs by current-driven Josephson vortices in layered superconductors
Related Subjects
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
MAGNETIC FLUX
ANNIHILATION
MAGNETIC SHIELDING
SUPERCONDUCTING FILMS
ALUMINIUM
BISMUTH ALLOYS
DESIGN
EXPERIMENTAL DATA
LEAD BASE ALLOYS
MATHEMATICAL MODELS
MAXWELL EQUATIONS
MEISSNER-OCHSENFELD EFFECT
NUMERICAL ANALYSIS
ALLOYS
BASIC INTERACTIONS
DATA
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTS
EQUATIONS
FILMS
INFORMATION
INTERACTIONS
LEAD ALLOYS
MATHEMATICS
METALS
NUMERICAL DATA
PARTIAL DIFFERENTIAL EQUATIONS
SHIELDING
420201* - Engineering- Cryogenic Equipment & Devices
656100 - Condensed Matter Physics- Superconductivity