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Rectified vortex motion in an Nb film with a spacing-graded array of holes
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SYSNO ASEP 0342309 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Rectified vortex motion in an Nb film with a spacing-graded array of holes Author(s) Wu, T.C. (TW)
Cao, R. (TW)
Yang, T.-J. (TW)
Horng, L. (TW)
Wu, J.C. (TW)
Koláček, Jan (FZU-D) RID, ORCIDSource Title Solid State Communications. - : Elsevier - ISSN 0038-1098
Roč. 150, 5-6 (2010), s. 280-284Number of pages 5 s. Language eng - English Country GB - United Kingdom Keywords superconductor ; thin films ; scanning electron microscopy, ; flux pinning Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GA202/08/0326 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000274459600013 DOI 10.1016/j.ssc.2009.11.006 Annotation Superconducting Nb thin films with a spacing-graded array of holes were prepared by electron beam lithography. Two films with different hole gradients were fabricated. The ac-driven vortices were investigated in Nb superconductors with a spacing-graded array of holes. The measurements revealed pronounced rectified voltage when the vortex lattice is driven by an ac injected current. The rectified voltage is mainly caused by the strength of the vortex-vortex interaction. The rectified motion of a vortex is affected by the pinning potential of the spacing-graded array and the applied magnetic field. The vortex-vortex interaction strength changes the effective pinning landscape of the vortices and an asymmetric potential is formed. Vortices depin easily from high concentration to low concentration of pinning sites. In both samples, the ac-driven vortices exhibit a variety of dynamical responses and the rectified voltage is tunable with the applied magnetic field. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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