National Changhua University of Education Institutional Repository : Item 987654321/15396
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题名: The Ac Effect of Vortex Pinning in the Arrays of Defect Sites on Nb Films
作者: Wu, T. C.;Horng, Lance;Wu, J. C.;Hsiao, C. W.;Kolacek, Jan;Yang, T. J.
贡献者: 物理學系
日期: 2006
上传时间: 2013-02-05T02:19:19Z
出版者: American Institute of Physics
摘要: Niobium thin films with spacing-graded array of submicrometer-scaled holes had been fabricated using electron beam lithography through a lift-off technique. The magnetoresistance measurements and current-voltage characteristics were carried out with the external magnetic field applied perpendicular to the film plane, in which commensurable effects were observed in both experiments. The magnetoresistance with positive/negative directions of dc current revealed identical curves except the dips at matching fields separated. Two distinct current-voltage curves, which resulted from the positive and negative applied current directions, respectively, were discerned when the external magnetic field was fixed at the matching field, which is believed to be due to asymmetry pinning potential in the spacing-graded array of holes. In addition, ac current-voltage curve measured at matching field showed a ratchet bump along with another extra peak associated with incommensurable effect.
關聯: J. Appl. Phys., 99(8): 08M515
显示于类别:[物理學系] 期刊論文

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