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    Suppression of superconductivity in Nb by IrMn in IrMn/Nb bilayers

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    Type
    Article
    Authors
    Wu, B. L.
    Yang, Y. M.
    Guo, Zaibing
    Wu, Y. H.
    Qiu, J. J.
    KAUST Department
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Imaging and Characterization Core Lab
    Date
    2013-10-11
    Online Publication Date
    2013-10-11
    Print Publication Date
    2013-10-07
    Permanent link to this record
    http://hdl.handle.net/10754/552319
    
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    Abstract
    Effect of antiferromagnet on superconductivity has been investigated in IrMn/Nb bilayers. Significant suppression of both transition temperature (Tc) and lower critical field (Hc1) of Nb is found in IrMn/Nb bilayers as compared to a single layer Nb of same thickness; the suppression effect is even stronger than that of a ferromagnet in NiFe/Nb bilayers. The addition of an insulating MgO layer at the IrMn-Nb interface nearly restores Tc to that of the single layer Nb, but Hc1 still remains suppressed. These results suggest that, in addition to proximity effect and magnetic impurity scattering, magnetostatic interaction also plays a role in suppressing superconductivity of Nb in IrMn/Nb bilayers. In addition to reduced Tc and Hc1, the IrMn layer also induces broadening in the transition temperature of Nb, which can be accounted for by a finite distribution of stray field from IrMn.
    Citation
    Suppression of superconductivity in Nb by IrMn in IrMn/Nb bilayers 2013, 103 (15):152602 Applied Physics Letters
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.4824891
    Additional Links
    http://scitation.aip.org/content/aip/journal/apl/103/15/10.1063/1.4824891
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4824891
    Scopus Count
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    Articles; Imaging and Characterization Core Lab

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