Abstract
In order to achieve high magnetic field in superconducting magnet, superconducting tape conductor with effective pinning centers is required for high critical current density. We studied periodic artificial pinning centers for the scope of use in HTS tape conductor. Periodic patterns were introduced as artificial pinning centers on a superconducting Nb film. To investigate the effect of flux pinning, 2 and 4 μm period groove patterns were formed on the Nb film with various depths. Magnetization and critical current density of the films with the groove patterns were larger than those of the film without the pattern, as a result of effective artificial pinning. After regarding immanent magnetization caused by defects, films with 2 μm period grooves had about 2 times as much increase of magnetization as the films with 4 μm period grooves. Ratio of pinning force density of 2 μm period groove pattern to that of 4 μm period groove pattern was calculated to be 2, and we found this calculated value is in good agreement with the experimental one. The magnetization of both films increased with groove depth until that reached a half of film thickness. It is considered that this increase of magnetization with groove depth is mainly caused by an increase of elementary pinning force for individual flux line.
| Original language | English |
|---|---|
| Pages (from-to) | 1113-1116 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 12 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2002 Mar |
| Externally published | Yes |
| Event | 17th Annual Conference on Magnet Technology - Geneva, Switzerland Duration: 2001 Sep 24 → 2001 Sep 28 |
Keywords
- Flux pinning
- Nb thin film
- Pinning center
- Pinning force
- Superconductor
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering