Thickness dependence of magnetic behavior of LaAlO3/SrTiO3 heterostructures

Hu, Hai-Long and Wang, Danyang and Tseng, Allen and Chen, Zhigang and Kong, Charlie and Yi, Jiabao and Li, Sean (2018) Thickness dependence of magnetic behavior of LaAlO3/SrTiO3 heterostructures. Advanced Materials Interfaces, 5 (13 - Article 1800352).


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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials
Date Deposited: 04 Mar 2019 03:12
Last Modified: 05 Mar 2019 01:13
Uncontrolled Keywords: LaAlO3/SrTiO3 heterostructures; magnetic behavior; spin‐glass‐like behavior; oxygen vacancy; spintronics application
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Funding Details:
Identification Number or DOI: 10.1002/admi.201800352

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