Abstract
( La 0.7 Sr 0.3 Mn O 3 ) 0.5 : ( Zn O ) 0.5 nanocomposite thin films were deposited on c-cut sapphire substrates via pulsed laser deposition. The as-grown films were composed of fine grains of 20–50nm size. The epitaxial orientation relationships between the La0.7Sr0.3MnO3 (LSMO) and the sapphire was (111)LSMO∕∕(0003)Al2O3 and ⟨112¯⟩LSMO∕∕⟨101¯0⟩Al2O3. A low field magnetoresistance (LFMR) of ∼12% was achieved at an external magnetic field of H=1T at 77K, possibly due to enhanced grain boundary effects. The postannealed film had columnar structures with well-crystallized large grains (∼200nm), and showed a low resistivity and consequently negligible LFMR similar to that of single crystal LSMO.
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