magnetic shielding; magnetic measurements; superconductors
Abstract :
[en] To date, magnetic shields utilizing high-temperature
superconductor materials mostly comprise bulk materials, usually
shaped into a cylinder and then heat treated. We analyze the potential
of thin-film technology, whereby a layer of superconductor
is deposited on a substrate, to fabricate magnetic shields. Films
deposited on a curved surface are inevitably granular, leading to
reduced critical current density compared with crystalline films.
This limits the maximum field that can be screened. Granular
films also have an enhanced penetration depth compared with the
bulk value, which determines the maximum possible screening at
applied fields below the maximum.We demonstrate the utility of a
mutual inductancemeasurement to evaluate small flat test samples
of a granular film for their potential as a shielding material in a
more complex geometry. Thismeasurement predicts both themaximum
magnetic field that can be screened and the residual leakage
at fields below the maximum. The tested film was produced by
the Electrophoretic deposition of YBCO on a silver substrate. The
maximum screening field was comparable with that obtained for a
similar film on a cylindrical substrate. We also show comparable
results from a crystalline YBCO film.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Physics Electrical & electronics engineering
Author, co-author :
Claassen, John; Nova Research, Inc. USA
Osofsky, Michael; U.S. Naval Research Laboratory > Washington DC, USA
Namburi, Devendra; Université de Liège - ULiège > Department of Chemistry > SUPRATECS
Vanderbemden, Philippe ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
ULiège - Université de Liège [BE] FWB - Fédération Wallonie-Bruxelles [BE] F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] ONR - Office of Naval Research Global [US-VA] [US-VA]
O. G. Symko, W. J. Yeh, and D. J. Zheng, "Magnetic shielding and relaxation characteristics of superconducting YBa2Cu307 tubes," J. Appl. Phys., vol. 65, no. 5, pp. 2142-2144, 1989.
G. Grenci, S. Denis, L. Dusoulier, F. Pavese, and N. Penazzi, "Preparation and characterization of YBa2Cu3O7-x thick films deposited on silver substrates by the electrophoretic deposition technique for magnetic screening applications," Supercond. Sci. Technol., vol. 19, no. 4, pp. 249-255, Apr. 2006.
P. G. deGennes, Superconductivity of Metals and Alloys. New York, NY, USA: W. A. Benjamin, Inc., 1966, p. 194.
J. H. Claassen, M. L. Wilson, J. M. Byers, and S. Adrian, "Optimizing the two-coil mutual inductance measurement of the superconducting penetration depth in thin films," J. Appl. Phys., vol. 82, no. 6, pp. 3028-3034, Sep. 15, 1997.
M. W. Coffey, "Analyzing mutual inductance measurements to determine the London penetration depth," J. Appl. Phys., vol. 87, no. 9, pp. 4344-4351, Sep. 1997.
M.W. Coffey, "Mutual inductance of superconducting thin films," J. Appl. Phys., vol. 89, no. 10, pp. 5570-5577, May 2001.
J. H. Claassen, M. E. Reeves, and R. J. Soulen, Jr., "A contactless method for measurement of the critical current density and critical temperature of superconducting films," Rev. Sci. Instrum., vol. 62, no. 4, pp. 996-1004, Apr. 1991.
B. Giovannini and L. Weiss, "Critical current and order parameter in Josephson arrays," Solid State Commun., vol. 28, no. 12, pp. 1005-1007, Dec. 1978.
J. R. Clem, "Granular and superconducting-glass properties of the hightemperature superconductors," Physica C, vol. 153-155, pt. 1, pp. 50-55, Jun. 1988.
R. Closset et al., "YBa2Cu3O7-δ thick films for magnetic shielding: Electrophoretic deposition from butanol-based suspension," Mater. Lett., vol. 119, pp. 154-156, Mar. 2014.
