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VOLUME 88 | ISSUE 1 | PAGE 50
Extraordinary magnetic field behavior of SIFS Josephson junctions with an inhomogeneous transparency of the FS interface
M. Yu. Kupriyanov*, N. G. Pugach*, M. M. Khapaev*, A. V. Vedyayev*, E. B. Goldobin+, D. Koelle+, R. Kleiner+
*M.V. Lomonosov Moscow State University, 119992 Moscow, Russia
+Physikalisches Institut-Experimentalphysik II and Center for Collective Quantum Phenomena, Universität Tübingen, Germany


PACS: 74.50.+r, 74.80.Dm, 75.30.Et
Abstract
Within the framework of the Usadel equations the Josephson effect in a superconductor-insulator-ferromagnet-superconductor (SIFS) structure with spatially heterogeneous transparency of the SF interface has been studied. It is shown that at a certain thickness of the F-layer a step-like variation of the transparency leads to the formation of a region of size \sim\xi_F (coherence length in a ferromagnet) where the Josephson supercurrents of different signs may flow. This may lead to a dependence of the junction critical current on the external magnetic field qualitatively different from the Fraunhofer pattern typically observed in usual Josephson junctions.


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