Anisotropic current-induced electroresistance effect in low-doped La0.9Sr0.1MnO3 thin films

We have studied the giant negative electroresistance (ER) in strips and pillars of single-layer La0.9Sr0.1MnO3 films fabricated by micro-fabrication patterning processes, and observed the different voltage–current (V–I) characteristics under current-in-plane (CIP) and current-perpendicular-to-plane (CPP) measurement modes, around room temperature. For the CIP mode, V–I curves show an asymmetry with jumps at the negative bias currents, while a symmetrical hysteresis against the polarity for the CPP one. The mechanism is illuminated in the letter. Furthermore, a large ER is obtained for both modes and the ER ratios increase monotonically with the temperature and bias current, suggestive of a promising potential in future device developments.