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Title: Vortex Ratchet Effect in a Niobium Film with Spacing-graded Density of Pinning Sites
Authors: Wu, T. C.;Horng, Lance;Wu, Jong-Ching;Cao, R.;Koláček, Jan;Yang, T. J.
Contributors: 物理學系
Date: 2007
Issue Date: 2014-06-06T07:18:54Z
Publisher: American Institute of Physics
Abstract: 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 above∕below 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.
Relation: Journal of Applied Physics, 102(3): 033918
Appears in Collections:[Department of Physics] Periodical Articles

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