Abstract
The highly textured Nd 0.6Sr 0.4MnO 3 thin films with different thickness t were obtained. The maximum magnetoresistance (MR) ratio, defined as [R(0)−R(1.5 T)]/R(0) at the insulating- to metallic-phase transition temperature, was found to increase with decreasing t, reaching a value of 75% for t=500 Å. However, when t was further decreased down to 100 Å, the MR ratio was not significantly affected. In conjunction with our topographic results, we have attributed the saturation of MR ratio to the achieving of an optimized interface strain.
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