Origin of the inverse spin-switch behavior in manganite/cuprate/manganite trilayers

N. M. Nemes, M. García-Hernández, S. G E Te Velthuis, A. Hoffmann, C. Visani, J. Garcia-Barriocanal, V. Peña, D. Arias, Z. Sefrioui, C. Leon, J. Santamaría

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Abstract

We studied ferromagnet/superconductor/ferromagnet trilayers based on La0.7 Ca0.3 MnO3 manganite and YBa2 Cu3 O7-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.

Original languageEnglish (US)
Article number094515
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number9
DOIs
StatePublished - Sep 19 2008

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