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- W2023757624 abstract "Abstract Epitaxial superlattices of La 0.7 Ca 0.3 MnO 3 and La 0.7 Sr 0.3 MnO 3 (LCMO/LSMO) N , grown on SrTiO 3 , were obtained by the sputtering technique with the same overall thickness (57 nm) but different number of bilayers ( N = 9 , 12 , 17 , 35 ). The resulting T c (around 292 K) is unexpectedly high and close to the LSMO film T c (305 K). The measured coercive field and saturation magnetization are identical in all of them indicating that interfaces are not playing a direct role in the ferromagnetic interaction, but the volume fraction of paramagnetic Mn increases with the number of interfaces (2 N ). The MR and residual resistivity behaviors are consistent with the presence of paramagnetic Mn at the interfaces and the narrowing of the magnetic domain walls. At room temperature a high low-field-MR ratio is obtained, about 1% at 500 Oe, but no further increase is detected increasing the number of interfaces." @default.
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- W2023757624 date "2005-07-01" @default.
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- W2023757624 title "Superlattices of magnetoresistive Ca- and Sr-doped manganese perovskites: Interface effects" @default.
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- W2023757624 doi "https://doi.org/10.1016/j.jmmm.2005.03.065" @default.
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