Phys. Rev. B 78, 094515 (2008) [5 pages]Origin of the inverse spin-switch behavior in manganite/cuprate/manganite trilayersReceived 6 August 2008; published 19 September 2008 We studied ferromagnet/superconductor/ferromagnet trilayers based on La0.7Ca0.3MnO3 manganite and YBa2Cu3O7−δ (YBCO) high-Tc 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.094515
DOI:
10.1103/PhysRevB.78.094515
PACS:
74.78.Fk, 72.25.−b, 75.47.−m
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