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Self-assembled epitaxial La 0.7 Sr 0.3 MnO 3 :NiO (LSMO:NiO) nanocomposite thin films were grown on (001)-oriented SrTiO 3 substrates by pulsed laser deposition, and their microstructures and magnetoresistance (MR) properties were investigated. The room temperature MR effect at a low magnetic field has been realized in the composite films, and the maximum MR value is 18.7% at 300 K and 1 T. The room temperature MR properties at the low magnetic field can be attributed to the special structure, which is made up of the nano-sized LSMO and NiO columns. The room temperature MR properties at low magnetic fields will facilitate its extensive room temperature applications. IMPACT STATEMENT The room temperature magnetoresistance properties at a low magnetic field has been realized in the self-assembled epitaxial La 0.7 Sr 0.3 MnO 3 :NiO nanocomposite thin films by controlling the microstructures.

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