Pinning effects induced by periodic arrays of structural corrugations in Nb thin films

Lance Horng, Jong-Ching Wu, P. C. Kang, P. H. Lin, T. C. Wu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Artificial vortex pinning arrays have been fabricated by electron-beam lithography in conjunction with reactive ion etching in Nb superconducting thin films in order to investigate flux pinning. Based on the structural corrugation in the Nb thin film, the square lattice of defects that act as pinning centers was created. A strong periodic pinning effect, as the vortex lattice matches the array of defects, can be observed in the evolution of resistivity and critical current with the applied magnetic fields in the mixed state of the Nb film, thus, revealing a synchronized pinning effect due to structural corrugation. This result is in agreement with the resistivity-temperature curves at matching fields and half-integer matching fields in which a crossover occurs for temperatures exceeding a certain threshold value. The phenomenon is related to the presence of the pinning structure at matching fields.

Original languageEnglish
Pages (from-to)2679-2680
Number of pages2
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number5 A
Publication statusPublished - 2003 May 1

Fingerprint

Vortex flow
Flux pinning
Thin films
Defects
Superconducting films
Electron beam lithography
Critical currents
Reactive ion etching
thin films
Magnetic fields
Temperature
vortices
electrical resistivity
flux pinning
defects
integers
critical current
crossovers
lithography
etching

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "Artificial vortex pinning arrays have been fabricated by electron-beam lithography in conjunction with reactive ion etching in Nb superconducting thin films in order to investigate flux pinning. Based on the structural corrugation in the Nb thin film, the square lattice of defects that act as pinning centers was created. A strong periodic pinning effect, as the vortex lattice matches the array of defects, can be observed in the evolution of resistivity and critical current with the applied magnetic fields in the mixed state of the Nb film, thus, revealing a synchronized pinning effect due to structural corrugation. This result is in agreement with the resistivity-temperature curves at matching fields and half-integer matching fields in which a crossover occurs for temperatures exceeding a certain threshold value. The phenomenon is related to the presence of the pinning structure at matching fields.",
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Pinning effects induced by periodic arrays of structural corrugations in Nb thin films. / Horng, Lance; Wu, Jong-Ching; Kang, P. C.; Lin, P. H.; Wu, T. C.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 42, No. 5 A, 01.05.2003, p. 2679-2680.

Research output: Contribution to journalArticle

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