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29 March 2024
 
  » arxiv » 1101.4817

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Manifestation of New Interference Effects in Superconductor/Ferromagnet Spin Valve
P. V. Leksin ; N. N. Garifyanov ; I. A. Garifullin ; J. Schumann ; V. Kataev ; O. G. Schmidt ; B. Buchner ;
Date 25 Jan 2011
AbstractSuperconductor/ferromagnet (S/F) spin valve effect theories based on the S/F proximity phenomenon assume that the superconducting transition temperature Tc of F1/F2/S or F1/S/F2 trilayers for parallel magnetizations of the F1- and F2-layers (TcP) are smaller than for the antiparallel orientations (TcAP). Here, we report for CoOx/Fe1/Cu/Fe2/In multilayered systems with varying Fe2-layer thickness the sign-changing oscillating behavior of the spin valve effect Delta Tc=TcAP-TcP. Our measurements revealed the full direct spin valve effect with TcAP>TcP for Fe2-layer thickness dFe2<1 nm and the full inverse (TcAP<TcAP) spin valve effect for dFe2>=1 nm. Interference of Cooper pair wave functions reflected from both surfaces of the Fe2-layer appear as the most probable reason for the observed behavior of Delta Tc.
Source arXiv, 1101.4817
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