Abstract
The behavior of superconducting transition temperature T C in superconducting/ferromagnetic (S/F) multilayers as a function of different layer thicknesses and for varying magnetic moment μ B of the F layer atoms is studied. Multilayer structures consist of five bilayers of constant superconducting Nb layer thickness of 400 Å and Fe of 6 and 24 Å each. The analysis of the magnetization data revealed that for t Fe=6 Å, the Fe layer is non-magnetic. The interpretation of the observed T C behavior is attributed to the change of the interaction of the cooper pairs with this layer at the onset of ferromagnetism for t Fe=6 Å. The hysteresis curve recorded under isothermal conditions at 4.5 K for [Nb (400 Å)/Fe (6 Å)] 5 multilayers shows the usual M– H hysteresis behavior which is typical of a hard type-II superconductor exhibiting an irreversibility field H irr of 3.5 kOe with substantial pinning at lower field. In addition, [Nb(400 Å)/Fe(6 Å)] 5 multilayer displays anomalous behavior in the form of paramagnetic peak in the superconducting state just below the transition temperature T C=6.25 K.
Published Version
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