Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.17: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Magnetization-Orientation Dependence of the Superconducting Transition in AF-F/S/F and S/F/F-AF Type Spin Valve Heterostructures — •Vladimir Zdravkov^1,2, Daniel Lenk¹, Jan Kehrle¹, Günter Obermeier¹, Aladin Ullrich¹, Claus Müller¹, Hans-Albrecht Krug von Nidda¹, Roman Morari², Anatoli Sidorenko², Lenar Tagirov³, Siegfried Horn¹, and Reinhard Tidecks¹ — ¹Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany — ²D. Ghitsu Institute of the Electronic Engineering and Nanotechnologies ASM, MD 2028 Kishiniev, Moldova — ³Solid State Physics Department, Kazan Federal University, 420008 Kazan, Russia

In F/S/F spin valve core structures, i.e. Cu₄₁Ni₅₉/Nb/Cu₄₁Ni₅₉ systems, deposited on an antiferromagnetic CoOx layer, or with such a layer on top, critical temperature oscillations and reentrant superconductivity are observed, which can be well described by the theory. Introducing a Co sub-layer yields exchange bias effects, which influence the magnetic field dependence of the superconducting transition. Aging effects are studied, which especially alter the transparency of the lower F/S interface, resulting in a change of the behavior of the transition temperature as a function of the ferromagnetic layer thickness from extinction, over reentrant, to oscillating.

The results are discussed in comparison to the S/F/F-AF triplet spin valve effect in a Nb/Cu₄₁Ni₅₉/nc-Nb/Co/CoO_x system, where nc-Nb acts as a normal conducting spacer to decouple the ferromagnetic layers.