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Thickness Dependence of Magnetic Behavior of LaAlO 3 /SrTiO 3 Heterostructures
Author(s) -
Hu HaiLong,
Wang Danyang,
Tseng Allen,
Chen Zhigang,
Kong Charlie,
Yi Jiabao,
Li Sean
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201800352
Subject(s) - materials science , heterojunction , spintronics , condensed matter physics , magnetism , ferromagnetism , magnetic moment , spin glass , optoelectronics , physics
Thickness dependence of magnetic properties of LaAlO 3 (LAO)/SrTiO 3 (STO) heterostructures is systematically studied. It is found that the magnetic moment is rather robust at elevated temperatures in the samples grown under ultralow P O2 of 1 × 10 −8 Torr, indicating room‐temperature ferromagnetism in the LaAlO 3 /SrTiO 3 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 TiO 2 layer. It is believed that the well‐controlled magnetism by tuning the LAO thickness may open an avenue for the potential application of spintronics with LaAlO 3 /SrTiO 3 heterostructures.