Hysteretic Loss vs. Filament Width in Thin YBCO Films Near the Penetration Field (Postprint)
Abstract
Magnetization vs. applied field measurements (M-H loops) were taken on YBCO thin films with filaments patterned into them. The YBCO was deposited onto LaAlO3 substrates using PLD, and the filaments were formed by laser ablation. M-H loops were taken at 4.2 K in fields up to plus or minus 9 T using a vibrating sample magnetometer technique, the field applied perpendicular to the film width, d. The losses were seen to be greatly reduced by filament width reductions following the standard expression Qh/Hm alpha dJc/10. The penetration field was also well described by the standard "high field" expression = Hp = (0.4Jct ) ln(d/t + 1), where t is the film thickness. The regimes of applicability of the loss expression were investigated, in particular near Hm approximates Hp. A more general form of the loss equation was obtained and compared with the high-field approximation. The result was that although Qh/Hm still increased in proportion to d, the rate of increase decreased as Hm approached Hp.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2003
- Accession Number
- ADA462091
Entities
People
- Charles E. Oberly
- Coleman B. Cobb
- E. Lee
- E. W. Collings
- Justin Tolliver
- M. D. Sumption
- Paul N. Barnes
- Timothy J. Haugan
Organizations
- Ohio State University