Periodic artificial pinning centers for high critical current density of tape conductor

Hiroshi Yamada, Naoyuki Harada, Tadashi Iwamoto, Keigo Sugai, Makoto Tsuda, Takatarou Hamajima

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


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 languageEnglish
Pages (from-to)1113-1116
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 2002 Mar
Event17th Annual Conference on Magnet Technology - Geneva, Switzerland
Duration: 2001 Sept 242001 Sept 28


  • Flux pinning
  • Nb thin film
  • Pinning center
  • Pinning force
  • Superconductor


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