Thickness Dependence of Magnetic Behavior of LaAlO3/SrTiO3 Heterostructures

Hai Long Hu; Danyang Wang; Allen Tseng; Zhigang Chen; Charlie Kong; Jiabao Yi; Sean Li

doi:10.1002/admi.201800352

Thickness Dependence of Magnetic Behavior of LaAlO₃/SrTiO₃ Heterostructures

Hai Long Hu, Danyang Wang^*, Allen Tseng, Zhigang Chen, Charlie Kong, Jiabao Yi, Sean Li

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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 P_O2 of 1 × 10⁻⁸ Torr, indicating room-temperature ferromagnetism 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 potential application of spintronics with LaAlO₃/SrTiO₃ heterostructures.

Original language	English
Article number	1800352
Journal	Advanced Materials Interfaces
Volume	5
Issue number	13
DOIs	https://doi.org/10.1002/admi.201800352
State	Published - 9 Jul 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

LaAlO/SrTiO heterostructures
magnetic behavior
oxygen vacancy
spin-glass-like behavior
spintronics application

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering

Access to Document

10.1002/admi.201800352

Cite this

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title = "Thickness Dependence of Magnetic Behavior of LaAlO3/SrTiO3 Heterostructures",

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 ferromagnetism 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 potential application of spintronics with LaAlO3/SrTiO3 heterostructures.",

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author = "Hu, \{Hai Long\} and Danyang Wang and Allen Tseng and Zhigang Chen and Charlie Kong and Jiabao Yi and Sean Li",

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AU - Hu, Hai Long

AU - Wang, Danyang

AU - Tseng, Allen

AU - Chen, Zhigang

AU - Kong, Charlie

AU - Yi, Jiabao

AU - Li, Sean

PY - 2018/7/9

Y1 - 2018/7/9

N2 - 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 ferromagnetism 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 potential application of spintronics with LaAlO3/SrTiO3 heterostructures.

AB - 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 ferromagnetism 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 potential application of spintronics with LaAlO3/SrTiO3 heterostructures.

KW - LaAlO/SrTiO heterostructures

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KW - oxygen vacancy

KW - spin-glass-like behavior

KW - spintronics application

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