%0 Journal Article
%A Nemes, Norbert Marcel
%A García Hernández, M.
%A te Velthuis, S. G. E.
%A Hoffmann, A.
%A Visani, C.
%A Garcia Barriocanal, Javier
%A Peña, V.
%A Arias Serna, Diego
%A Sefrioui, Zouhair
%A León Yebra, Carlos
%A Santamaría Sánchez-Barriga, Jacobo
%T Origin of the inverse spin-switch behavior in manganite/cuprate/manganite trilayers
%D 2008
%@ 1098-0121
%U https://hdl.handle.net/20.500.14352/51403
%X We studied ferromagnet/superconductor/ferromagnet trilayers based on La_(0.7)Ca_(0.3)MnO_(3) manganite and YBa_(2)Cu_(3)O_(7−δ) (YBCO) high-T_(c) cuprate with magnetoresistance and magnetization measurements. We find an inverse superconducting spin-switch behavior, where superconductivity is favored for parallel alignment of the magnetization in the ferromagnetic layers. We argue that this inverse superconducting spin switch originates from the transmission of spin-polarized carriers into the superconductor. In this picture, the thickness dependence of the magnetoresistance yields the spin-diffusion length in YBCO as 13 nm. A comparison of bilayers and trilayers allows ruling out the effect of the stray fields of the domain structure of the ferromagnet as the source of the inverse superconducting spin switch.
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