National Changhua University of Education Institutional Repository : Item 987654321/15416

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NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/15416

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/15416

Title:	Vortex Ratchet Effect in a Niobium Film with Spacing-graded Density of Pinning Sites
Authors:	Wu, T. C.;Horng, Lance;Wu, J. C.;Cao, R.;Koláček, Jan;Yang, T. J.
Contributors:	物理學系
Date:	2007
Issue Date:	2013-02-05T02:19:51Z
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:	J. Appl. Phys., 102(3): 033918
Appears in Collections:	[Department of Physics] Periodical Articles

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