Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1996-09-25
1998-07-14
Snow, Walter E.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
505726, 324654, G01R 33035, G01R 3312
Patent
active
057810095
ABSTRACT:
An improved two-coil apparatus for measuring the absolute value of magnetic penetration depth .lambda. of superconductor films which is capable of measuring the absolute value of magnetic penetration depth which is denoted as .lambda. of a large area high temperature superconductor film using a low frequency or a static weak magnetic field, which includes a drive coil that is designed to suppresses the screening current of the film at the film edge a receive coil opposingly spaced-apart from the drive coil; sample holders disposed at the left-and right-sides of the receive coil; a large area low temperature superconductor film attached on the sample holder between the drive coil and the receive coil; and a large area high temperature superconductor film mounted on the large area low temperature superconductor film between the drive coil and the receive coil.
REFERENCES:
"Penetration depth in YBa.sub.2 Cu.sub.3 O.sub.7-.delta. thin films from far-infrared transmission," L.A. de Vaulchier, et al., Physical Review B, vol. 52, No. 1, Jul. 1995, polygon.564-569.
"Penetration depths of High T.sub.c films measured by two coil mutual inductances," A.T. Fiory, et al., Applied Physics Letters, vol. 52, No. 25, Jun. 1988, polygon.2165-2167.
"Magnetic penetration depth in Ni-and Zn-doped YBa.sub.2 (Cu.sub.1-x M.sub.x) .sub.3 O.sub.7 films," E.R. Ulm, et al., Physical Review B, vol.51, No. 14, Apr. 1995, polygon, 9193-9198.
"Observation of the superconducting proximity effect from kinetic-inductance measurements," J.H. Claassen, et al, Physical Review B, vol.44, No. 17, Nov. 1991, polygon 9605-9608.
"Magnetic field penetration through a superconducting film,: A.B. Pipard, Superconductor Science and Technology", vol. 7, 1994, polygon. 696-699.
"Determining the absolute value of penetration depth in large area superconductor films" J.Y. Lee, et al., submitted to Applied Physics Letters.
Choi Sang Sam
Hahn Taek-Sang
Lee Ju-Young
Korea Institute of Science and Technology
Snow Walter E.
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