Metallic conduction and ferromagnetism in M Al                         2                         O                         4                         /SrTiO                         3                          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 M Al ₂ O ₄ /SrTiO ₃ spinel/perovskite heterostructures (M = Fe, Co, Ni)

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

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

13 Scopus citations

Abstract

Recently, a high mobility quasi-two-dimensional electron gas has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al ₂ O ₃ and perovskite SrTiO ₃ (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl ₂ O ₄ (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl ₂ O ₄ (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although FeAl ₂ O ₄ /STO is insulating, the NiAl ₂ O ₄ /STO and CoAl ₂ O ₄ /STO heterointerfaces are found to be highly metallic and exhibit the anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 10 ⁴ cm ² V ^-1 s ^-1 , comparable to that of the γ-Al ₂ O ₃ /STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al ₂ O ₃ /STO at temperatures below 5 K, while the enhanced AHE in NiAl ₂ O ₄ /STO and CoAl ₂ O ₄ /STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl ₂ O ₄ spinel films.

Original language	English
Article number	261603
Journal	Applied Physics Letters
Volume	113
Issue number	26
DOIs	https://doi.org/10.1063/1.5063540
State	Published - 24 Dec 2018
Externally published	Yes

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Zhang, Y., Gan, Y., Zhang, H., Zhang, H., Norby, P., Shen, B., Sun, J., & Chen, Y. (2018). Metallic conduction and ferromagnetism in M Al ₂ O ₄ /SrTiO ₃ spinel/perovskite heterostructures (M = Fe, Co, Ni) Applied Physics Letters, 113(26), Article 261603. https://doi.org/10.1063/1.5063540

Zhang, Yu ; Gan, Yulin ; Zhang, Hongrui et al. / Metallic conduction and ferromagnetism in M Al ₂ O ₄ /SrTiO ₃ spinel/perovskite heterostructures (M = Fe, Co, Ni) In: Applied Physics Letters. 2018 ; Vol. 113, No. 26.

@article{2e6f73cb5cca4ef595eb9b517622fedc,

title = " Metallic conduction and ferromagnetism in M Al 2 O 4 /SrTiO 3 spinel/perovskite heterostructures (M = Fe, Co, Ni) ",

abstract = " Recently, a high mobility quasi-two-dimensional electron gas has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al 2 O 3 and perovskite SrTiO 3 (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl 2 O 4 (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl 2 O 4 (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although FeAl 2 O 4 /STO is insulating, the NiAl 2 O 4 /STO and CoAl 2 O 4 /STO heterointerfaces are found to be highly metallic and exhibit the anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 10 4 cm 2 V -1 s -1 , comparable to that of the γ-Al 2 O 3 /STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al 2 O 3 /STO at temperatures below 5 K, while the enhanced AHE in NiAl 2 O 4 /STO and CoAl 2 O 4 /STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl 2 O 4 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",

note = "Publisher Copyright: {\textcopyright} 2018 Author(s).",

year = "2018",

month = dec,

day = "24",

doi = "10.1063/1.5063540",

language = "英语",

volume = "113",

journal = "Applied Physics Letters",

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Zhang, Y, Gan, Y, Zhang, H, Zhang, H, Norby, P, Shen, B, Sun, J & Chen, Y 2018, ' Metallic conduction and ferromagnetism in M Al ₂ O ₄ /SrTiO ₃ spinel/perovskite heterostructures (M = Fe, Co, Ni) ', Applied Physics Letters, vol. 113, no. 26, 261603. https://doi.org/10.1063/1.5063540

Metallic conduction and ferromagnetism in M Al ₂ O ₄ /SrTiO ₃ spinel/perovskite heterostructures (M = Fe, Co, Ni) . / Zhang, Yu; Gan, Yulin; Zhang, Hongrui et al.
In: Applied Physics Letters, Vol. 113, No. 26, 261603, 24.12.2018.

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

TY - JOUR

T1 - Metallic conduction and ferromagnetism in M Al 2 O 4 /SrTiO 3 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 - 2018/12/24

Y1 - 2018/12/24

N2 - Recently, a high mobility quasi-two-dimensional electron gas has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al 2 O 3 and perovskite SrTiO 3 (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl 2 O 4 (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl 2 O 4 (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although FeAl 2 O 4 /STO is insulating, the NiAl 2 O 4 /STO and CoAl 2 O 4 /STO heterointerfaces are found to be highly metallic and exhibit the anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 10 4 cm 2 V -1 s -1 , comparable to that of the γ-Al 2 O 3 /STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al 2 O 3 /STO at temperatures below 5 K, while the enhanced AHE in NiAl 2 O 4 /STO and CoAl 2 O 4 /STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl 2 O 4 spinel films.

AB - Recently, a high mobility quasi-two-dimensional electron gas has been reported for the heterointerface between two insulating and nonmagnetic oxides of spinel γ-Al 2 O 3 and perovskite SrTiO 3 (STO). Herein, we fabricated the epitaxial heterostructure with Al-based magnetic spinel oxide MAl 2 O 4 (M = Fe, Co, Ni) on perovskite STO. Remarkably, all the MAl 2 O 4 (M = Fe, Co, Ni) films exhibit ferromagnetic behavior up to room temperature. Although FeAl 2 O 4 /STO is insulating, the NiAl 2 O 4 /STO and CoAl 2 O 4 /STO heterointerfaces are found to be highly metallic and exhibit the anomalous Hall effect (AHE) at temperatures below 30 K. Their Hall mobility is as high as 3 × 10 4 cm 2 V -1 s -1 , comparable to that of the γ-Al 2 O 3 /STO interface. There has been evidence of oxygen-vacancy-related magnetism in γ-Al 2 O 3 /STO at temperatures below 5 K, while the enhanced AHE in NiAl 2 O 4 /STO and CoAl 2 O 4 /STO likely comes from the magnetic proximity effect induced by the top ferromagnetic MAl 2 O 4 spinel films.

UR - https://www.scopus.com/pages/publications/85059531498

U2 - 10.1063/1.5063540

DO - 10.1063/1.5063540

M3 - 文章

AN - SCOPUS:85059531498

SN - 0003-6951

VL - 113

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 26

M1 - 261603

ER -

Zhang Y, Gan Y, Zhang H, Zhang H, Norby P, Shen B et al. Metallic conduction and ferromagnetism in M Al ₂ O ₄ /SrTiO ₃ spinel/perovskite heterostructures (M = Fe, Co, Ni) Applied Physics Letters. 2018 Dec 24;113(26):261603. doi: 10.1063/1.5063540

Metallic conduction and ferromagnetism in M Al ₂ O ₄ /SrTiO ₃ spinel/perovskite heterostructures (M = Fe, Co, Ni)

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