Shaanxi Key Laboratory of Condensed Matter Structures and Properties, School of Science , Northwestern Polytechnical University , Xi'an 710072 , China.
ACS Appl Mater Interfaces. 2018 Apr 25;10(16):14209-14213. doi: 10.1021/acsami.8b03275. Epub 2018 Apr 12.
Magnetic two-dimensional electron gases at the oxide interfaces are always one of the key issues in spintronics, giving rise to intriguing magnetotransport properties. However, reports about magnetic two-dimensional electron gases remain elusive. Here, we obtain the magnetic order of LaAlO/SrTiO systems by introducing magnetic dopants at the La site. The transport properties with a characteristic of metallic behavior at the interfaces are investigated. More significantly, magnetic-doped samples exhibit obvious magnetic hysteresis loops and the mobility is enhanced. Meanwhile, the photoresponsive experiments are realized by irradiating all samples with a 360 nm light. Compared to magnetism, the effects of dopants on photoresponsive and relaxation properties are negligible because the behavior originates from SrTiO substrates. This work paves a way for revealing and better controlling the magnetic properties of oxide heterointerfaces.
氧化物界面处的二维磁性电子气一直是自旋电子学中的关键问题之一，这导致了有趣的磁输运性质。然而，关于二维磁性电子气的报道仍然难以捉摸。在这里，我们通过在 La 位引入磁性掺杂剂获得 LaAlO/SrTiO 体系的磁有序。研究了具有界面处金属行为特征的输运性质。更重要的是，磁性掺杂样品表现出明显的磁滞回线，迁移率得到提高。同时，通过用 360nm 光照射所有样品来实现光响应实验。与磁性相比，掺杂剂对光响应和弛豫性质的影响可以忽略不计，因为这种行为源于 SrTiO 衬底。这项工作为揭示和更好地控制氧化物异质界面的磁性铺平了道路。
