Possible origin for oscillatory superconducting transition temperature in superconductor/ferromagnet multilayers
Possible origin for oscillatory superconducting transition temperature in superconductor/ferromagnet multilayers
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DOI：
10.1103/physrevlett.77.1857
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发表时间：
1996-08-26
影响因子：
8.6
通讯作者：
Zabel, H
中科院分区：
文献类型：
--
作者：
Muhge, T;Garifyanov, NN;Zabel, H
我们研究了溅射Fe/Nb/Fe三层膜的超导和磁性。对于一定的Nb厚度和不同的Fe厚度d（Fe），观察到超导转变温度Tc的非单调行为，在d（Fe）约为10埃处出现最大值。对磁化数据的分析表明，对于d（Fe）小于或等于7埃，Fe层是磁性的。对所观察到的T-c行为的解释归因于该磁性“死"层的存在以及在铁磁性福特（Fe）大于或等于7埃时库珀对与该层的相互作用的变化。
We have studied superconducting and magnetic properties of sputtered Fe/Nb/Fe trilayers. For a fixed Nb thickness and with changing Fe thickness, d(Fe), a nonmonotonic behavior of the superconducting transition temperature T-c was observed with a maximum at d(Fe) approximate to 10 Angstrom. The analysis of the magnetization data revealed that for d(Fe) less than or equal to 7 Angstrom the Fe layer is nonmagnetic. The interpretation of the observed T-c behavior is attributed to the existence of this magnetically ''dead'' layer and the change of the interaction of the Cooper pairs with this layer at the onset of ferromagnetism ford(Fe) greater than or equal to 7 Angstrom.