• Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      Ratchet; rectification; Lorentz microscopy; niobium

    • Abstract


      We have investigated the vortex dynamics for the ‘ratchet’ operation in a niobium superconductor via a direct imaging of Lorentz microscopy. We directly observe one-directional selective motion of field-gradient-driven vortices along fabricated channels. This results from the rectification of vortices in a spatially asymmetric potential under the oscillating magnetic field in a temporally symmetric manner. Based on the observation of the individual motion of vortices, we clarify the elementary process involved in this rectification.

    • Author Affiliations


      Yoshihiko Togawa1 Ken Harada1 2 Tetsuya Akashi2 3 Hiroto Kasai1 2 Tsuyoshi Matsuda1 4 Atsutaka Maeda1 5 Akira Tonomura1 2

      1. Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Hatoyama, Saitama - 350-0395, Japan
      2. Advanced Research Laboratory, Hitachi Ltd, Akanuma, Hatoyama, Saitama - 350-0395, Japan
      3. Hitachi Instruments Service Co. Ltd, Yotsuya, Shinjyuku-ku, Tokyo - 160-0004, Japan
      4. Hitachi Science Systems Ltd, Ishikawa, Hitachinaka, Ibaraki - 312-0057, Japan
      5. Department of Basic Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo - 153-8902, Japan
    • Dates

  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.