Abstract
We studied the temperature dependence of transport and magnetoresistance (MR) of Co–Ti–O nanocomposite film with well-controlled size distribution, composition, and microstructure. Co–Ti–O nanocomposite film with pure metallic Co particles embedded in the oxygen-deficient TiO2 matrix was fabricated by an optimized film growth condition. Our results reveal that spin-dependent tunneling conductance is the dominant conductance mechanism at low temperature, and as temperature increases spin-independent hopping through chains of localized states in the insulating barriers becomes increasingly prominent. The almost constant MR ratio above 60 K and its slight enhancement at low temperature were observed. The enhanced MR at low temperature is ascribed to the onset of higher-order cotunneling in the Coulomb blockade regime, as well as the suppression of spin-independent hopping process with decreasing temperature.
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