The quantitative determination of flux density gradients and volume pinning forces in patterned YBCO thin films using the magnetooptical Faraday effect
✍ Scribed by Alexander Forkl; Hanns-Ulrich Habermeier; Bernd Leibold; Helmut Kronmüller
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 281 KB
- Volume
- 185-189
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
In circular patterned YBCO thin films the penetration of magnetic flux is observed directly and locally using the high resolution magneto-optical Faradayeffect in t~olds applied perpendicular to the film plane. The radial distribution of the z-component of magnetic flux Bz(r ) and its gradient 0Bz/& are measured. For the determination of the critical current density #oJc = rotB the curvature of the radial component 0Br[~ z cannot be neglected, consequently, the determination of Jc must be obtained by a comparison of measured and calculated Bz(r ) profiles. Values for Jc determined by this procedure agree fairly well with the corresponding transport critical current as well as the magnetically determined Jc"