Publication: Origin of the inverse spin-switch behavior in manganite/cuprate/manganite trilayers
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2008-09
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American Physical Society
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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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© 2008 The American Physical Society. This work was supported by MAT 2005 under Contract No. 06024 C02 01-02, the Joint US-Spain World Materials Proposal NSF MWN Proposal DMR Contract No. 0709584 and MEC MAT 2007 Contract No. 30922-E, and by the US-DOE BES under Contract No. DE-AC02-06CH11357. N.M.N. acknowledges the “Ramon y Cajal” contract of the MICINN.
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