Magnetism\nControl by Doping in LaAlO₃/SrTiO₃ Heterointerfaces

Abstract

Magnetic two-dimensional\nelectron gases at the oxide interfaces are always one of the key issues\nin spintronics, giving rise to intriguing magnetotransport properties.\nHowever, reports about magnetic two-dimensional electron gases remain\nelusive. Here, we obtain the magnetic order of LaAlO₃/SrTiO₃ systems by introducing magnetic dopants at the La site. The\ntransport properties with a characteristic of metallic behavior at\nthe interfaces are investigated. More significantly, magnetic-doped\nsamples exhibit obvious magnetic hysteresis loops and the mobility\nis enhanced. Meanwhile, the photoresponsive experiments are realized\nby irradiating all samples with a 360 nm light. Compared to magnetism,\nthe effects of dopants on photoresponsive and relaxation properties\nare negligible because the behavior originates from SrTiO₃ substrates. This work paves a way for revealing and better controlling\nthe magnetic properties of oxide heterointerfaces.