Origin of the Inverse spin-switch behavior in manganite/cuprate/manganite trilayers.
We studied ferromagnet/superconductor/ferromagnet trilayers based on La{sub 0.7}Ca{sub 0.3}MnO{sub 3} manganite and YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) high-T{sub 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Juan de la Cierva Fellowship; Marie-Curie IRG Grant
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 965750
- Report Number(s):
- ANL/MSD/JA-60085; PRLTAO; TRN: US200920%%394
- Journal Information:
- Phys. Rev. Lett., Vol. 78, Issue 2008; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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