Two-dimensional electron gas at manganite buffered LaAlO_3/SrTiO_3 (001) interface by spin coating chemical methods

摘要

High mobility spin-polarized two-dimensional electron gas (2DEG) is crucially important for spintronic applications. Here, we report our investigations on the 2DEG fabricated by spin coating a LaAlO3 layer on a (001) SrTiO3 substrate with a La2/3Sr1/3MnO3 buffer layer. When the buffer layer is below 3 uc, the 2DGE is highly mobile. Corresponding to the layer thicknesses of 0, 1, and 2 uc, the Hall mobilities are similar to 24 000 cm(2)/V s, similar to 28 000 cm(2)/V s, and similar to 59 600 cm(2)/V s at 2K. In contrast, the 2DEG with a buffer layer of 3 uc shows a relatively lowmobility (similar to 3000 cm(2)/V s). However, an anomalous Hall effect was observed in this 2DEG below 20 K, indicating a long range ferromagnetic order. This work demonstrates the great potential of the chemical method in gaining high quality spin-polarized 2DEGs at the LaAlO3/SrTiO3 interface. Published by AIP Publishing.