Physics – Condensed Matter – Superconductivity
Scientific paper
2008-03-04
Phys. Rev. B 77, 052509 (2008)
Physics
Condensed Matter
Superconductivity
5 figures
Scientific paper
10.1103/PhysRevB.77.052509
Thin film heterostructures provide a powerful means to study the antagonism between superconductivity (SC) and ferromagnetism (FM). One interesting issue in FM-SC hybrids which defies the notion of antagonistic orders is the observation of magnetic field induced superconductivity (FIS). Here we show that in systems where the FM domains/islands produce spatial inhomogeneities of the SC order parameter, the FIS can derive significant contribution from different mobilities of the magnetic flux identified by two distinct critical states in the inhomogeneous superconductor. Our experiments on nanoengineered bilayers of ferromagnetic CoPt and superconducting NbN where CoPt/NbN islands are separated by a granular NbN, lend support to this alternative explanation of FIS in certain class of FM-SC hybrids.
Bhuvana T.
Budhani Ramesh Chandra
Kulkarni Giridhar U.
Kulkarni Naveen V.
Rakshit R. K.
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