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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.54: Poster

Montag, 14. März 2011, 14:00–18:00, P4

FFLO like State in Bilayers and Trilayers of Superconductors and Ferromagnets: The Spin-Valve Core Structure — •Vladimir Zdravkov^1,2, Jan Kehrle¹, Günter Obermeier¹, Aladin Ulrich¹, Claus Müller¹, Roman Morari², Anatolie Sidorenko², Lenar Tagirov³, Reinhard Tidecks¹, and Siegfried Horn¹ — ¹Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany — ²Institute of Electronic Engineering and Nanotechnologies ASM, MD 2028 Kishiniev, Moldova — ³Solid State Physics Department, Kazan State University, 420008 Kazan, Russia

Critical temperature oscillations and reentrant superconductivity has been observed in thin film bilayers and trilayers made of Nb as superconducting (S) and Cu₄₁Ni₅₉ as ferromagnetic (F) metal, for increasing F-layer thickness. This effect is caused by the establishing of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) like state in these geometries, leading to interference effects of the superconducting pairing wave function. While in our former investigations S/F bilayers were investigated [1], we here report on F/S bilayers where the S-metal now is grown on top of the F-metal, and the combination of both building blocks to a F/S/F trilayer, i.e. the core structure of the superconducting spin valve [2].
V. I. Zdravkov, J. Kehrle, G. Obermeier, et al. Phys. Rev. B 82, 054517 (2010)
L. R. Tagirov, Phys. Rev. Lett. 83, 2058 (1999)