Magneto-optical observations of vortices in anisotropic and nanostructured superconductors

T. Tamegai, H. Chiku, Y. Tsuchiya, H. Shibutani, Y. Nakajima

Research output: Contribution to journalArticlepeer-review


Magneto-optical imaging technique is applied to visualize vortex distribution in superconducting networks and in highly anisotropic superconductor Bi2Sr2CaCu2O8+y under tilted magnetic fields. We have succeeded in visualizing the vortex distribution in a finite-size superconducting network with the unit cell size as small as 6 × 6 μm2. We have also visualized the ratchet effect of pancake vortices induced by the time-asymmetric motion of Josephson vortices. The ratchet effect appears most clearly at the similar condition as the vortex lensing effect. The ratchet efficiency diminishes strongly as a function of frequency and it is almost completely suppressed above 1 kHz. Such a strong frequency dependence of the vortex ratchet effect is discussed based on the skin effect controlled by c-axis resistivity.

Original languageEnglish
Pages (from-to)531-536
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue number7-10
Publication statusPublished - 2008 Apr 1
Externally publishedYes


  • BiSrCaCuO
  • Crossing lattices
  • Superconducting network
  • Vortex ratchet

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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