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http://dx.doi.org/10.9714/psac.2016.18.1.033

Suppression of superconductivity in superconductor/ferromagnet multilayers  

Hwang, T.J. (Yeungnam University)
Kim, D.H. (Yeungnam University)
Publication Information
Progress in Superconductivity and Cryogenics / v.18, no.1, 2016 , pp. 33-36 More about this Journal
Abstract
Suppression of the superconducting transition temperature ($T_c$) of NbN thin films in superconductor/ferromagnet multilayers has been investigated. Both superconducting NbN and ferromagnetic FeN layers were deposited on thermally oxidized Si substrate at room temperature by using reactive magnetron sputtering in an $Ar-N_2$ gas mixture. The thickness of FeN films was fixed at 20 nm, while the thickness of NbN films was varied from 3 nm to 90 nm. $T_c$ suppression was clearly observed in NbN layers up to 70 nm thickness when NbN layer was in proximity with FeN layer. For a given thickness of NbN layer, the magnitude of $T_c$ suppression was increased in the order of Si/FeN/NbN, Si/NbN/FeN, and Si/FeN/NbN/FeN structure. This result can be used to design a spin switch whose operation is based on the proximity effect between superconducting and ferromagnetic layers.
Keywords
Proximity effect; NbN/FeN bilayer; NbN/FeN trilayer;
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Times Cited By KSCI : 2  (Citation Analysis)
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