Linear response of thin superconductors in perpendicular magnetic fields: An asymptotic analysis

Linear response of thin superconductors in perpendicular magnetic fields: An asymptotic analysis.

The linear response of a thin superconducting strip subjected to an applied perpendicular time-dependent magnetic field is treated analytically using the method of matched asymptotic expansions. The calculation of the induced current density is divided into two parts: an “outer” problem, in the middle of the strip, which can be solved using conformal mapping; and an “inner” problem near each of...

AC Response of Thin Film Superconductors at Various Temperatures and Magnetic Fields

A common method for measuring the electromagnetic properties of superconductors is to measure their complex magnetic ac susceptibility χ as a function of frequency ω and amplitude H0, and of temperature T and applied dc magnetic field H dc a as parameters. The basic theory of the linear χ(ω) and nonlinear χ(H0, ω) is outlined for various geometries, e.g. disks, rings, and strips of thin films o...

Influence of perpendicular magnetic fields on the domain structure of permalloy microstructures grown on thin membranes

C. Dietrich,1,* R. Hertel,2 M. Huber,1 D. Weiss,1 R. Schäfer,3 and J. Zweck1 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany 2Institut für Festkörperforschung (IFF-9), Forschungszentrum Jülich, 52425 Jülich, Germany 3Leibniz-Institut für Festkörperund Werkstoffforschung (IFW), 01069 Dresden, Germany Received 5 March 20...

Shielding with superconductors in small magnetic fields

2014 The shielding properties of a superconducting lead shell have been investigated in fields of the order of 10-4 gauss. The small ambient fields were obtained with a room size 03BC-metal shield. Fields of less than 2 microgauss were obtained over a sphere of 7.5 cm diameter. This region is at room temperature and is suitable for magnetometer testing. REVUE DE PHYSIQUE APPLIQUÉE TOME 5, FÉVRI...

Paraconductivity of underdoped La2-xSrxCuO4 thin-film superconductors using high magnetic fields