Thickness Dependence of Magnetic Behavior of LaAlO3/SrTiO3 Heterostructures
Article
Article Title | Thickness Dependence of Magnetic Behavior of LaAlO3/SrTiO3 Heterostructures |
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ERA Journal ID | 210043 |
Article Category | Article |
Authors | Hu, Hai-Long (Author), Wang, Danyang (Author), Tseng, Allen (Author), Chen, Zhigang (Author), Kong, Charlie (Author), Yi, Jiabao (Author) and Li, Sean (Author) |
Journal Title | Advanced Materials Interfaces |
Journal Citation | 5 (13), pp. 1-7 |
Article Number | 1800352 |
Number of Pages | 7 |
Year | 2018 |
Publisher | John Wiley & Sons |
Place of Publication | Germany |
ISSN | 2196-7350 |
Digital Object Identifier (DOI) | https://doi.org/10.1002/admi.201800352 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/full/10.1002/admi.201800352 |
Abstract | Thickness dependence of magnetic properties of LaAlO3 (LAO)/SrTiO3 (STO) heterostructures is systematically studied. It is found that the magnetic moment is rather robust at elevated temperatures in the samples grown under ultralow PO2 of 1 × 10−8 Torr, indicating room-temperature ferromag-netism in the LaAlO3/SrTiO3 heterostructures. Spin-glass-like behavior is observed in the LAO/STO heterostructures with the LAO thickness ranging from 5 to 90 unit cells (2–35.2 nm). As the LAO layer becomes thicker, the blocking temperature of spin-glass-like behavior decreases and magnetic moment weakens, which may be related to the reduced density of oxygen vacancies at the interfacial TiO2 layer. It is believed that the well-controlled magnetism by tuning the LAO thickness may open an avenue for the poten-tial application of spintronics with LaAlO3/SrTiO3 heterostructures. |
Keywords | LaAlO3/SrTiO3 heterostructures; magnetic behavior; spin‐glass‐like behavior; oxygen vacancy; spintronics application |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Byline Affiliations | University of New South Wales |
University of New South Wales | |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) |
https://research.usq.edu.au/item/q5273/thickness-dependence-of-magnetic-behavior-of-laalo3-srtio3-heterostructures
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