DocumentCode :
784699
Title :
Periodic artificial pinning centers for high critical current density of tape conductor
Author :
Yamada, Hiroshi ; Harada, Naoyuki ; Iwamoto, Tadashi ; Sugai, Keigo ; Tsuda, Makoto ; Hamajima, Takatarou
Author_Institution :
Fac. of Eng., Yamaguchi Univ., Japan
Volume :
12
Issue :
1
fYear :
2002
fDate :
3/1/2002 12:00:00 AM
Firstpage :
1113
Lastpage :
1116
Abstract :
For 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 use in HTS tape conductor. Periodic patterns were introduced as artificial pinning centers on a superconducting Nb film. 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 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. The magnetization of both films increased with groove depth until it 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.
Keywords :
critical current density (superconductivity); flux pinning; high-temperature superconductors; magnetisation; superconducting magnets; superconducting tapes; superconducting thin films; 2 micron; 4 micron; HTS; Nb; critical current density; flux pinning; groove depth; immanent magnetization; periodic artificial pinning centers; superconducting film; superconducting magnet; tape conductor; Conductors; Critical current density; Flux pinning; High temperature superconductors; Magnetic films; Magnetization; Niobium; Superconducting cables; Superconducting films; Superconducting magnets;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2002.1018596
Filename :
1018596
Link To Document :
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