Direct observation of rectified motion of vortices by Lorentz microscopy

Pramana

Akira Tonomura1¹  Tetsuya Akashi2²  Ken Harada1¹  Yoshihiko Togawa1¹  Hiroto Kasai1¹  Atsutaka maeda1¹  Tsuyoshi Matsuda1¹ 

[1] Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Hatoyama, Saitama 350-0395, Japan$$;Advanced Research Laboratory, Hitachi Ltd, Akanuma, Hatoyama, Saitama 350-0395, Japan$$

关键词: Ratchet;    rectification;    Lorentz microscopy;    niobium.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown