Transport critical current in superconductor/ferromagnet trilayered films

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• 作者：Kobayashi ; Satoru ; Kanno ; Yusuke ; Itoh ; Fumitake
• 关键词：74.80.Dm ; 74.60.Jg ; Critical current ; Superconductor/ferromagnet heterostructure ; Flux pinning
• 刊名：Physica B
• 出版年：2003
• 出版时间：May, 2003
• 年：2003
• 卷：329-333
• 期：Part 2
• 页码：1357-1358
• 全文大小：90.5 K

文摘

We have measured the critical current density, J_c, in RF-sputtered Co/Nb/Co trilayers under magnetic fields parallel to the film surface. Unlike the usual low-field dependence of J_c in conventional superconductors, J_c depends on the remanent state of ferromagnetic layer above the superconducting temperature and shows an anomalous dip around zero field, associated with the hysteresis. This observation indicates that the critical current density is strongly reduced by in-plane magnetization of the ferromagnetic layer in contact with the superconducting one.