Magneto-optical investigation of flux penetration in Y1Ba2Cu3O7 thin films
Abstract
Using the magneto-optical Faraday effect the magnetic flux penetration into high Tc superconducting Y1Ba2Cu3O7 thin films is investigated. Epitaxially grown high quality films (Tc≳88 K, jc≳106 A/cm2 at 77 K) show a flux penetration in three steps, the formation of a flux front if the acting magnetic field reaches Hc1 at the edge of the specimen, the movement of the flux front towards the center of the sample, and the increase of the flux density after the flux front reaches the center. The remanent state shows trapped magnetic flux in the film, indicating inhomogeneously distributed pinning centers.
- Publication:
-
Applied Physics Letters
- Pub Date:
- September 1990
- DOI:
- 10.1063/1.104283
- Bibcode:
- 1990ApPhL..57.1067F
- Keywords:
-
- Faraday Effect;
- High Temperature Superconductors;
- Magneto-Optics;
- Mixed Oxides;
- Superconducting Films;
- Thin Films;
- Barium Oxides;
- Copper Oxides;
- Luminous Intensity;
- Magnetic Flux;
- Magnetic Measurement;
- Microstructure;
- Optical Measurement;
- Yttrium Alloys;
- Solid-State Physics