DC magnetization studies in Nb/Fe superconducting multilayers |
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Authors: | S M Chaudhari Sujeet Chaudhary S B Roy P Chaddah B A Dasannacharya |
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Abstract: | The behavior of superconducting transition temperature TC in superconducting/ferromagnetic (S/F) multilayers as a function of different layer thicknesses and for varying magnetic moment μB 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 tFe=6 Å, the Fe layer is non-magnetic. The interpretation of the observed TC behavior is attributed to the change of the interaction of the cooper pairs with this layer at the onset of ferromagnetism for tFe=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 Hirr 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 TC=6.25 K. |
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Keywords: | Magnetization Multilayer Superconductivity |
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