Room-temperature perpendicular magnetic anisotropy of Pt/Co/AlOxtrilayers on SrTiO3(001)

Ye Du; Shoma Arai; Shingo Kaneta-Takada; Le Duc Anh; Shutaro Karube; Makoto Kohda; Shinobu Ohya; Junsaku Nitta

doi:10.1063/5.0023282

Room-temperature perpendicular magnetic anisotropy of Pt/Co/AlO_xtrilayers on SrTiO₃(001)

Ye Du, Shoma Arai, Shingo Kaneta-Takada, Le Duc Anh, Shutaro Karube, Makoto Kohda, Shinobu Ohya, Junsaku Nitta

ENG - Materials Science

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

Abstract

We demonstrate room-temperature perpendicular magnetic anisotropy (PMA) in Pt/Co/AlOx trilayers sputter-deposited onto a SrTiO3 (STO) (001) substrate. Reflection high-energy electron diffraction and x-ray diffraction results confirm the two-dimensional polycrystalline nature for both Pt and Co layers in PMA films, which are (111) oriented in the out-of-plane direction. While the PMA in Pt/Co/AlOx trilayers on STO (001) is found to have interfacial origins, sizable PMA is maintained when Pt layer thickness is as thin as 1 nm, which is several times to one order of magnitude smaller than the reported values of the spin diffusion length for Pt, thus facilitating spin transmission along the thin-film-normal direction. With the STO (001) substrate serving as the fundamental building block for realizing giant Rashba spin splitting, this work provides a feasible platform for the investigation of magnetization switching in two-dimensional-electron-gas-based magnetic hetero-structures at room temperature.

Original language	English
Article number	105010
Journal	AIP Advances
Volume	10
Issue number	10
DOIs	https://doi.org/10.1063/5.0023282
Publication status	Published - 2020 Oct 1

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title = "Room-temperature perpendicular magnetic anisotropy of Pt/Co/AlOxtrilayers on SrTiO3(001)",

abstract = "We demonstrate room-temperature perpendicular magnetic anisotropy (PMA) in Pt/Co/AlOx trilayers sputter-deposited onto a SrTiO3 (STO) (001) substrate. Reflection high-energy electron diffraction and x-ray diffraction results confirm the two-dimensional polycrystalline nature for both Pt and Co layers in PMA films, which are (111) oriented in the out-of-plane direction. While the PMA in Pt/Co/AlOx trilayers on STO (001) is found to have interfacial origins, sizable PMA is maintained when Pt layer thickness is as thin as 1 nm, which is several times to one order of magnitude smaller than the reported values of the spin diffusion length for Pt, thus facilitating spin transmission along the thin-film-normal direction. With the STO (001) substrate serving as the fundamental building block for realizing giant Rashba spin splitting, this work provides a feasible platform for the investigation of magnetization switching in two-dimensional-electron-gas-based magnetic hetero-structures at room temperature.",

author = "Ye Du and Shoma Arai and Shingo Kaneta-Takada and Anh, {Le Duc} and Shutaro Karube and Makoto Kohda and Shinobu Ohya and Junsaku Nitta",

note = "Funding Information: This work was partly supported by the Grants-in-Aid for Scientific Research by MEXT (Grant Nos. 18H03860 and 15H05699) and the Spintronics Research Network of Japan (Spin-RNJ). The authors would like to thank Professor Nobuki Tezuka for the help on the in-plane x-ray diffraction measurement. We also thank Professor Hitoshi Tabata and Professor Munetoshi Seki for technical support for the substrate treatment and Shu Kitamura and Daichi Sugawara for technical support on the MOKE measurement. Publisher Copyright: {\textcopyright} 2020 Author(s).",

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language = "English",

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AU - Du, Ye

AU - Arai, Shoma

AU - Kaneta-Takada, Shingo

AU - Anh, Le Duc

AU - Karube, Shutaro

AU - Kohda, Makoto

AU - Ohya, Shinobu

AU - Nitta, Junsaku

N1 - Funding Information: This work was partly supported by the Grants-in-Aid for Scientific Research by MEXT (Grant Nos. 18H03860 and 15H05699) and the Spintronics Research Network of Japan (Spin-RNJ). The authors would like to thank Professor Nobuki Tezuka for the help on the in-plane x-ray diffraction measurement. We also thank Professor Hitoshi Tabata and Professor Munetoshi Seki for technical support for the substrate treatment and Shu Kitamura and Daichi Sugawara for technical support on the MOKE measurement. Publisher Copyright: © 2020 Author(s).

PY - 2020/10/1

Y1 - 2020/10/1

N2 - We demonstrate room-temperature perpendicular magnetic anisotropy (PMA) in Pt/Co/AlOx trilayers sputter-deposited onto a SrTiO3 (STO) (001) substrate. Reflection high-energy electron diffraction and x-ray diffraction results confirm the two-dimensional polycrystalline nature for both Pt and Co layers in PMA films, which are (111) oriented in the out-of-plane direction. While the PMA in Pt/Co/AlOx trilayers on STO (001) is found to have interfacial origins, sizable PMA is maintained when Pt layer thickness is as thin as 1 nm, which is several times to one order of magnitude smaller than the reported values of the spin diffusion length for Pt, thus facilitating spin transmission along the thin-film-normal direction. With the STO (001) substrate serving as the fundamental building block for realizing giant Rashba spin splitting, this work provides a feasible platform for the investigation of magnetization switching in two-dimensional-electron-gas-based magnetic hetero-structures at room temperature.

AB - We demonstrate room-temperature perpendicular magnetic anisotropy (PMA) in Pt/Co/AlOx trilayers sputter-deposited onto a SrTiO3 (STO) (001) substrate. Reflection high-energy electron diffraction and x-ray diffraction results confirm the two-dimensional polycrystalline nature for both Pt and Co layers in PMA films, which are (111) oriented in the out-of-plane direction. While the PMA in Pt/Co/AlOx trilayers on STO (001) is found to have interfacial origins, sizable PMA is maintained when Pt layer thickness is as thin as 1 nm, which is several times to one order of magnitude smaller than the reported values of the spin diffusion length for Pt, thus facilitating spin transmission along the thin-film-normal direction. With the STO (001) substrate serving as the fundamental building block for realizing giant Rashba spin splitting, this work provides a feasible platform for the investigation of magnetization switching in two-dimensional-electron-gas-based magnetic hetero-structures at room temperature.

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Room-temperature perpendicular magnetic anisotropy of Pt/Co/AlO_xtrilayers on SrTiO₃(001)

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