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Titolo:
Study of trapped flux in a superconducting thin film - Observation by scanning SQUID microscope and simulation
Autore:
Tanaka, K; Morooka, T; Odawara, A; Mawatari, Y; Nakayama, S; Nagata, A; Ikeda, M; Chinone, K; Koyanagi, M;
Indirizzi:
Seiko Instruments Inc, Chiba 2702222, Japan Seiko Instruments Inc Chiba Japan 2702222 ents Inc, Chiba 2702222, Japan Electrotech Lab, Tsukuba, Ibaraki 3058568, Japan Electrotech Lab Tsukuba Ibaraki Japan 3058568 uba, Ibaraki 3058568, Japan
Titolo Testata:
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
fascicolo: 1, volume: 11, anno: 2001,
parte:, 1
pagine: 230 - 233
SICI:
1051-8223(200103)11:1<230:SOTFIA>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Keywords:
trapped flux; surface barrier; magnetic flux density; scanning SQUID microscope system (SSM);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
7
Recensione:
Indirizzi per estratti:
Indirizzo: Tanaka, K Seiko Instruments Inc, 563 Takatsukashinden, Chiba 2702222, Japan Seiko Instruments Inc 563 Takatsukashinden Chiba Japan 2702222
Citazione:
K. Tanaka et al., "Study of trapped flux in a superconducting thin film - Observation by scanning SQUID microscope and simulation", IEEE APPL S, 11(1), 2001, pp. 230-233

Abstract

Flux trapping in superconducting devices, such as Josephson circuits and SQUIDs is a major cause for degradation of device performance. Intentionallymade holes and moats in superconducting films were previously found effective in overcoming the effects of flux trapping, Despite the need for a design rule for the arrangement of holes or moats, comparison between experiment and theory of the flux trapping locations has not yet been discussed. We therefore studied the locations of trapped fluxes in a superconducting thinfilm cooled at a rate of 0.02 K/sec for various external magnetic flux densities from 1 muT to 3 muT by using a scanning SQUID microscope. Trapped fluxes were observed at positions where holes were prepared in the superconducting film and also at superconducting locations outside the holes. Trappedfluxes outside the holes were orderly arranged regardless of magnetic fluxdensity during cooling. These locations were then compared with those determined by simulations based on a model that considers both the surface barrier effect introduced by Bean and Livingston and the interaction among fluxes, The simulation shows that the potential wells appear below the transition temperature, corresponding to the trapped fluxes outside holes.

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Documento generato il 06/04/20 alle ore 01:10:19