Abstract
La 0.7Ca 0.3MnO 3(LCMO)/Gd 0.7Ca 0.3MnO 3(GCMO) multilayers have been prepared by pulsed laser deposition. High-resolution transmission electron micrographs demonstrate that perfect hetero-epitaxial growth has been achieved in the LCMO/GCMO superlattices with strains. In the superlattices, the resistivity-peak temperature decreases with reducing the thickness of the LCMO layers. Large low field magnetoresistance (LFMR) of Δ ρ/ ρ H=278% is obtained at 78.5 K in a LCMO/GCMO superlattice when a magnetic field swept within ±3100 Oe. This result suggests that the interface strains between LCMO and GCMO layers may have influences on the magnetic transport properties and a suitable film structure could be used to increase the LFMR.
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