Abstract
The electronic transport behavior of La 0.67Sr 0.33MnO 3 epitaxial thin films with different thicknesses has been investigated under various applied DC currents. The 20 and 70 nm thick films show a giant negative electroresistance (ER). In contrast, the films with 100 nm thickness show unusual giant positive ER, which can reach 30% with the current density of 1.8×10 8 A/cm 2 at room temperature. It is interesting that the electric current can also change the magnetoresistance of the films. The results were explained by considering the spin polarized current induced increase of ferromagnetic metallic phase and current-induced lattice distortion via electron wind force under high current density.
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