磁调谐EuO/SrTiO $_3$界面上的二维电子系统
Two-dimensional electron system at the magnetically tunable EuO/SrTiO$_3$ interface
摘要：
我们创建一个二维电子系统（2DES）之间的界面EuO，铁磁绝缘体，和SrTiO 3，透明的非磁性绝缘体被认为是基于氧化物的电子的基石。这是通过在室温下沉积在SrTiO 3表面上的纯金属Eu之间的受控原位氧化还原反应来实现的，这是一种创新的自下而上的方法，可以很容易地推广到其他功能氧化物并扩展到应用。此外，我们发现，所得到的氧化铕盖帽层可以从顺磁性调整到铁磁性，这取决于层的厚度。这些结果表明，简单，新颖的技术，建立2DES的氧化物中的沉积元素还原剂[T。C. Rödel等人，高级材料28，1976（2016）]可以扩展以同时产生活性（例如磁性）覆盖层，从而能够实现和控制这种基于氧化物的2DES中的附加功能。
英文摘要：
We create a two-dimensional electron system (2DES) at the interface between EuO, a ferromagnetic insulator, and SrTiO3, a transparent non-magnetic insulator considered the bedrock of oxide-based electronics. This is achieved by a controlled in-situ redox reaction between pure metallic Eu deposited at room temperature on the surface of SrTiO3, an innovative bottom-up approach that can be easily generalized to other functional oxides and scaled to applications. Additionally, we find that the resulting EuO capping layer can be tuned from paramagnetic to ferromagnetic, depending on the layer thickness. These results demonstrate that the simple, novel technique of creating 2DESs in oxides by deposition of elementary reducing agents [T. C. Rödel et al., Adv. Mater. 28, 1976 (2016)] can be extended to simultaneously produce an active, e.g. magnetic, capping layer enabling the realization and control of additional functionalities in such oxide-based 2DESs.
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