Metallic Conduction and Ferromagnetism in MAl2O4/SrTiO3 Spinel/Perovskite Heterostructures (M=Fe, Co, Ni)

Yu  Zhang; Yulin Gan; Hongrui  Zhang; Hui  Zhang; Poul Norby; Baogen Shen; Jirong Sun; Yunzhong Chen

doi:10.1063/1.5063540

Metallic Conduction and Ferromagnetism in MAl₂O₄/SrTiO₃ Spinel/Perovskite Heterostructures (M=Fe, Co, Ni)

Yu Zhang, Yulin Gan, Hongrui Zhang, Hui Zhang, Poul Norby, Baogen Shen, Jirong Sun, Yunzhong Chen^*

^*Corresponding author for this work

Chinese Academy of Sciences

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Abstract

Recently, a high mobility quasi-two-dimensional electron gas (q-2DEG) has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al₂O₃ and perovskite SrTiO₃ (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl₂O₄ (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl₂O₄ (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although the FeAl₂O₄/STO is insulating, the NiAl₂O₄/STO and CoAl₂O₄/STO heterointerfaces are found to be highly metallic and exhibit anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 10⁴ cm²V^-1s^-1, comparable to that of γ-Al₂O₃/STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al₂O₃/STO at temperatures below 5 K, while the enhanced AHE in NiAl₂O₄/STO and CoAl₂O₄/STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl₂O₄ spinel films.

Original language	English
Article number	261603
Journal	Applied Physics Letters
Volume	113
Issue number	26
Number of pages	5
ISSN	0003-6951
DOIs	https://doi.org/10.1063/1.5063540
Publication status	Published - 2018

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@article{d87e0207857746239d4988c778c63d07,

title = "Metallic Conduction and Ferromagnetism in MAl2O4/SrTiO3 Spinel/Perovskite Heterostructures (M=Fe, Co, Ni)",

abstract = "Recently, a high mobility quasi-two-dimensional electron gas (q-2DEG) has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al2O3 and perovskite SrTiO3 (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl2O4 (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl2O4 (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although the FeAl2O4/STO is insulating, the NiAl2O4/STO and CoAl2O4/STO heterointerfaces are found to be highly metallic and exhibit anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 104 cm2V-1s-1, comparable to that of γ-Al2O3/STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al2O3/STO at temperatures below 5 K, while the enhanced AHE in NiAl2O4/STO and CoAl2O4/STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl2O4 spinel films. ",

author = "Yu Zhang and Yulin Gan and Hongrui Zhang and Hui Zhang and Poul Norby and Baogen Shen and Jirong Sun and Yunzhong Chen",

year = "2018",

doi = "10.1063/1.5063540",

language = "English",

volume = "113",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "26",

}

TY - JOUR

T1 - Metallic Conduction and Ferromagnetism in MAl2O4/SrTiO3 Spinel/Perovskite Heterostructures (M=Fe, Co, Ni)

AU - Zhang, Yu

AU - Gan, Yulin

AU - Zhang, Hongrui

AU - Zhang, Hui

AU - Norby, Poul

AU - Shen, Baogen

AU - Sun, Jirong

AU - Chen, Yunzhong

PY - 2018

Y1 - 2018

N2 - Recently, a high mobility quasi-two-dimensional electron gas (q-2DEG) has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al2O3 and perovskite SrTiO3 (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl2O4 (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl2O4 (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although the FeAl2O4/STO is insulating, the NiAl2O4/STO and CoAl2O4/STO heterointerfaces are found to be highly metallic and exhibit anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 104 cm2V-1s-1, comparable to that of γ-Al2O3/STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al2O3/STO at temperatures below 5 K, while the enhanced AHE in NiAl2O4/STO and CoAl2O4/STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl2O4 spinel films.

AB - Recently, a high mobility quasi-two-dimensional electron gas (q-2DEG) has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al2O3 and perovskite SrTiO3 (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl2O4 (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl2O4 (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although the FeAl2O4/STO is insulating, the NiAl2O4/STO and CoAl2O4/STO heterointerfaces are found to be highly metallic and exhibit anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 104 cm2V-1s-1, comparable to that of γ-Al2O3/STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al2O3/STO at temperatures below 5 K, while the enhanced AHE in NiAl2O4/STO and CoAl2O4/STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl2O4 spinel films.

U2 - 10.1063/1.5063540

DO - 10.1063/1.5063540

M3 - Journal article

SN - 0003-6951

VL - 113

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 26

M1 - 261603

ER -