Vortex matter in mesoscopic superconductors

Final Report Abstract

In this project, we have significantly advanced the experimental techniques to simultaneous and local measurements of vortex motion and guidance at low and high frequencies. The measurements delivered new and important results for the possibility and limitation of guidance and rectification of magnetic flux in conventional and HTS superconducting films due to patterning of microholes (antidots) as well as magnetic dots. The origin of the anomalous Hall effect could be identified. The guidance could be quantified, regimes of optimized guidance were determined. The patterns were adapted and optimized for the use of microwave applications. The electronic measurements were accompanied by visualization experiments (LSM, MO, and scanning Hall-probe) that confirmed the data of the resistive measurements. The experimental results are published, microwave experiments are prepared for publication. The project delivers new and supporting insight into vortex matter in nano- and microstructured superconductors. As such: - it will stimulate the discussion - it adds to the basic understanding of vortex manipulation and its characterization in nanostructured superconductors, and - it will help developing concepts for novel fluxonic devices.

Publications

• Crisan, A. Pross, D. Cole, S. J. Bending, R. Wördenweber, P. Lahl, and E. H. Brandt, Anisotropie vortex channeling in YBa2Cu3O7-δ thin films with ordered antidot arrays, Phys. Rev. B 71, 144504(2005)
  
  
• V.Yurchenko, M.Jirsa, O.Stupakov, and R.Wördenweber, On the Principles of Vortex Localization and Motion in Superconductor Thin Films with Artificially Patterned Cavities, Journal of Low Temperature Physics, Vol. 139 (2005) 331-338
  
  
• Lukashenko, A. V. Ustinov, A. P. Zhuravei, E. Hollmann, and R. Wördenweber, Laser scanning microscopy of guided vortex flow in microstructured high-Tc films, J. Appl. Phys. 100,023913(2006)
  
  
• M Jirsa, V Yurchenko, A V Bobyl, T H Johansen, D V Shantsev, R Wördenweber, Magnetic flux dynamics in a hexagonal network of superconducting islands, Physica C 404 (2004) 200-204
  
  
• M. P. Gonzalez, E. Hollmann and R. Wördenweber, Quantitative analysis of the guidance of vortices in superconducting films with magnetic dots, J. of Appl. Phys. 102, 063904 (2007)
  
  
• Marco S. Welling , Rinke J. Wijngaarden , Christof M. Aegerter, Roger Wördenweber and Peter Lahl, Flux flow anisotropy in superconducting films with a rectangular array of holes, Physica C: Superconductivity, Volume 404, Issues 1-4, 1 May 2004, Pages 410-414
  
  
• R Wördenweber, P Dymashevski, Guided vortex motion in high-Tc superconducting thin films and devices with special arrangement of artificial defects, Physica C 404 (2004) 421- 425
  
  
• R. Wördenweber, J.S.K. Sankarraj, P. Dymashevski and E. Hollmann, Anomalous Hall effect studied via guided vortex motion, Physica C 434, 101-104 (2006)
  
  
• R. Wördenweber, P. Dymashevski, and V. R. Misko, Guidance of Vortices and Vortex Ratchet Effect in High-Tc Superconducting Thin Films obtained with Special Arrangements of Antidots, Phys. Rev. B 69, 184504 (2004)
  
  
• V Yurchenko, P Lahl, S Bunte, M Jirsa, R Wördenweber, Analysis of the vortex dynamics in high-Tc superconducting thin films with regular arrays of artificial defects, Physica C 404 (2004) 426-430.
  
  
• V.V. Yurchenko, R. Wördenweber, Yu.M. Galperin, D.V. Shantsev, J.I. Vestgärden and T.H. Johansen, Magneto-optical imaging of magnetic flux patterns in superconducting films with antidots, Physica C: Superconductivity, 437-438, 357-360 (2006).