Thermally actuated magnetization flux pump in single-grain YBCO bulk

Y. Yan, Q. Li, T. Coombs

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Recent progress in material processing has proved that high temperature superconductors (HTS) have a great potential to trap large magnetic fields at cryogenic temperatures. For example, HTS are widely used in MRI scanners and in magnetic bearings. However, using traditional ways to magnetize, the YBCO will always need the applied field to be as high as the expected field on the superconductor or much higher than it, leading to a much higher cost than that of using permanent magnets. In this paper, we find a method of YBCO magnetization in liquid nitrogen that only requires the applied field to be at the level of a permanent magnet. Moreover, rather than applying a pulsed high current field on the YBCO, we use a thermally actuated material (gadolinium) as an intermedia and create a travelling magnetic field through it by changing the partial temperature so that the partial permeability is changed to build up the magnetization of the YBCO gradually after multiple pumps. The gadolinium bulk is located between the YBCO and the permanent magnet and is heated and cooled repeatedly from the outer surface to generate a travelling thermal wave inwards. In the subsequent experiment, an obvious accumulation of the flux density is detected on the surface of the YBCO bulk.
Original languageEnglish
Article number105011
Number of pages5
JournalSuperconductor Science & Technology
Volume22
Issue number10
Early online date16 Sep 2009
DOIs
Publication statusPublished - Oct 2009

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flux pumps
permanent magnets
Permanent magnets
Magnetization
High temperature superconductors
Gadolinium
Pumps
gadolinium
Fluxes
high temperature superconductors
magnetization
Magnetic fields
magnetic bearings
Magnetic bearings
multimedia
Liquid nitrogen
cryogenic temperature
magnetic fields
liquid nitrogen
Magnetic resonance imaging

Cite this

Thermally actuated magnetization flux pump in single-grain YBCO bulk. / Yan, Y.; Li, Q.; Coombs, T.

In: Superconductor Science & Technology, Vol. 22, No. 10, 105011, 10.2009.

Research output: Contribution to journalArticle

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