Manifestation of New Interference Effects in a Superconductor-Ferromagnet Spin Valve

P. V. Leksin; N. N. Garif’yanov; I. A. Garifullin; J. Schumann; V. Kataev; O. G. Schmidt; B. Büchner

doi:10.1103/PhysRevLett.106.067005

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Manifestation of New Interference Effects in a Superconductor-Ferromagnet Spin Valve

P. V. Leksin, N. N. Garif’yanov, I. A. Garifullin, J. Schumann, V. Kataev, O. G. Schmidt, B. Büchner

DOI 10.1103/PhysRevLett.106.067005 · Physical Review Letters

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Abstract

Superconductor-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 multilayers with varying Fe2-layer thickness the sign-changing oscillating behavior of the spin valve effect ΔTc=TcAP−TcP. We observe the full direct effect with TcAP>TcP for Fe2-layer thickness dFe2<1 nm and the full inverse (TcAP<TcP) 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 ΔTc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown