Journal
ACS APPLIED MATERIALS & INTERFACES
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c17638
Keywords
interfaces; anomalous Hall effect; high mobility; magnetic properties; large positive magnetoresistance
Funding
- National Natural Science Foundation of China [51572222]
- Key Research Project of the Natural Science Foundation of Shaanxi Province, China [2021JZ-08, 2020JM-088]
- Analytical and Testing Center of Northwestern Polytechnical University
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The engineered interfaces of complex oxides have diverse physical properties, providing a powerful platform for exploring fundamental physics and emergent phenomena. By introducing a few atomic layers of delta doping layer at LaAlO3/SrTiO3 interfaces and inserting a SrRuO3 buffer layer, the interfaces exhibit enhanced mobility and a large unsaturated positive magnetoresistance at low temperatures. These findings pave the way for further research on two-dimensional ferromagnetism and quantum transport in all-oxide systems.
The engineered interfaces of complex oxides have abundant physical properties and provide a powerful platform for the exploration of fundamental physics and emergent phenomena. In particular, research on the two-dimensional magnetic systems with high mobility remains a long-standing challenge for the discovery of quantum phase and spintronic applications. Here, we introduce a few atomic layers of the delta doping layer at LaAlO3/SrTiO3 interfaces through elaborately controllable epitaxial growth of SrRuO3. After inserting a SrRuO3 buffer layer, the interfaces exhibit a well-defined anomalous Hall effect up to 100 K and their mobility is enhanced by 3 orders of magnitude at low temperatures. More intriguingly, a large unsaturated positive magnetoresistance is created at interfaces. Combining with the density functional theory calculation, we attribute our findings to the electron transfer at interfaces and the magnetic moment of Ru4+ 4d bands. The results pave a way for further research of two-dimensional ferromagnetism and quantum transport in all-oxide systems.
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