6533b856fe1ef96bd12b2f0c
RESEARCH PRODUCT
History dependence of the magnetization of thin HTSC films: an explanation for distorted SQUID signals
P. Voss-de HaanGerhard JakobH. AdrianA. Wiensssubject
SuperconductivityPhysicsField (physics)Condensed matter physicsMagnetic momentMagnetometerEnergy Engineering and Power TechnologyCondensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionMagnetic fieldSQUIDMagnetizationScanning SQUID microscopylawCondensed Matter::SuperconductivityElectrical and Electronic Engineeringdescription
Abstract The magnetizations of thin film disk-shaped type-II superconductors in perpendicular magnetic fields are considered by aid of Mikheenko's critical state model which has been corrected by Zhu for the case of a time-varying periodic field. This paper presents the application of this scheme to an arbitrary nonperiodic time dependence H ( t ). We calculate the influence of field inhomogeneities in a magnetometer on the current density distribution of a disk-shaped type-II superconductor. The resulting SQUID pickup signals and magnetic moments are compared to measurements performed on a 200 nm thick YBa 2 Cu 3 O 7 film in the irreversible regime of the phase diagram. Theory and experiment show good agreement, even for heavily distorted SQUID signals.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-07-01 | Physica C: Superconductivity |