U.S. Department of EnergyOffice of Scientific and Technical Information
Annihilation of vortex-antivortex pairs in a superconducting shield
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- Ames Lab., IA (USA)
- OSTI Identifier:
- 6356474
- Report Number(s):
- IS-T-1276
ON: DE87010921
- DOE Contract Number:
- W-7405-ENG-82
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: Thesis. Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, 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
Citation Formats
Fang, Ming Ming. Annihilation of vortex-antivortex pairs in a superconducting shield. United States: N. p., 1987.
Web.
Fang, Ming Ming. Annihilation of vortex-antivortex pairs in a superconducting shield. United States.
Fang, Ming Ming. 1987.
"Annihilation of vortex-antivortex pairs in a superconducting shield". United States.
@article{osti_6356474,
title = {Annihilation of vortex-antivortex pairs in a superconducting shield},
author = {Fang, Ming Ming},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6356474},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1987},
month = {Mon Jun 01 00:00:00 EDT 1987}
}