Vortex ratchet effect in a niobium film with spacing-graded density of pinning sites

被引：0
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作者：
Wu, T.C. [1 ]
Horng, Lance [2 ]
Wu, J.C. [2 ]
Cao, R. [2 ]
Koláček, Jan [3 ]
Yang, T.J. [1 ]
机构：
[1] Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan
[2] Department of Physics, National Changhua University of Education, Changhua 500, Taiwan
[3] Institute of Physics, ASCR, Cukrovarnická 10, 16253 Prague 6, Czech Republic
来源：
Journal of Applied Physics | 2007年 / 102卷 / 03期
关键词：
The vortex propagation exhibits rectification effect in Nb superconductors with spacing-graded density of holes. A rectified dc voltage is obtained when the vortex lattice is driven by ac current. The asymmetric geometry of the pinning array produces a significant influence on the vortex motion. The rectified voltage depends considerably on the amplitude of the applied ac current and the magnetic field. The experimental results reveal a drastic change of the vortex rectification for magnetic field abovebelow the first matching field. The reason may be that the interstitial vortices are formed in the film above the first matching field. A reversible vortex motion is induced by the interstitial vortices for the field above the first matching field. © 2007 American Institute of Physics;
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