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Please use this identifier to cite or link to this item:
http://ir.ncue.edu.tw/ir/handle/987654321/15416
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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, J. C.;Cao, R.;Koláček, Jan;Yang, T. J. |
| Contributors: | 物理學系 |
| Date: | 2007
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| Issue Date: | 2013-02-05T02:19:51Z
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| 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: | [物理學系] 期刊論文
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