DOI: 10.1063/1.362657. Numerical modeling of a two-coil apparatus for measuring the magnetic penetration depth in superconducting films and arrays

Numerical modeling of a two-coil apparatus for measuring the magnetic penetration depth in superconducting films and arrays

10.1063/1.362657

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

We determine the magnetic penetration depth λ(T) in superconducting films by measuring the mutual inductance of two coils located on opposite sides of the films. The apparatus is designed to produce an accurate value for λ(0) without any assumptions about the dependence of λ(T/Tc)/λ(0) on T/Tc. In a typical configuration of coils and a 100±10 nm thick by 6 mm radius film, λ can be measured to better than ±12% as long as λ≳1500 Å. The noise level is typically ±2 Å. If two films are made the same way, so that they have the same thickness d, and they are measured in the same apparatus, then the relative uncertainty in λ between the two films is only ±9%, because uncertainties in d, the coil dimensions, etc., are eliminated. This article describes the apparatus and a detailed numerical model which illustrates the induced current density in the film and establishes the sources of uncertainties. The accuracy of the model is demonstrated through comparison with measurements on 0.15 mm thick circular Pb disks.

Bibliography

Turneaure, S. J., Ulm, E. R., & Lemberger, T. R. (1996). Numerical modeling of a two-coil apparatus for measuring the magnetic penetration depth in superconducting films and arrays. Journal of Applied Physics, 79(8), 4221â4227.

Authors 3

Stefan J. Turneaure (first)
Eric R. Ulm (additional)
Thomas R. Lemberger (additional)

References 9 Referenced 84

10.1063/1.99757 / Appl. Phys. Lett. (1988)
10.1103/PhysRevB.51.9193 / Phys. Rev. B (1995)
10.1063/1.102053 / Appl. Phys. Lett. (1989)
{'key': '2024020216120153500_r4', 'first-page': '70', 'volume': '40', 'year': '1995', 'journal-title': 'Bull. Am. Phys. Soc.'} / Bull. Am. Phys. Soc. (1995)
{'key': '2024020216120153500_r5', 'first-page': '3384', 'volume': '50', 'year': '1994', 'journal-title': 'Phys. Rev. B'} / Phys. Rev. B (1994)
10.1103/PhysRevB.52.10569 / Phys. Rev. B (1995)
10.1063/1.325953 / J. Appl. Phys. (1979)
{'key': '2024020216120153500_r8'}
{'key': '2024020216120153500_r9'}

Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 8:43 a.m.)
Deposited	1 year, 6 months ago (Feb. 2, 2024, 12:24 p.m.)
Indexed	6 days, 5 hours ago (Aug. 23, 2025, 9:24 p.m.)
Issued	29 years, 4 months ago (April 15, 1996)
Published	29 years, 4 months ago (April 15, 1996)
Published Print	29 years, 4 months ago (April 15, 1996)

Funders 0

None

BibTeX

@article{Turneaure_1996, title={Numerical modeling of a two-coil apparatus for measuring the magnetic penetration depth in superconducting films and arrays}, volume={79}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.362657}, DOI={10.1063/1.362657}, number={8}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Turneaure, Stefan J. and Ulm, Eric R. and Lemberger, Thomas R.}, year={1996}, month=apr, pages={4221–4227} }

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