Room-temperature perpendicular magnetic anisotropy of Pt/Co/AlOx trilayers 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

AIP Advances (Oct 2020)

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

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

Affiliations

Ye Du: Department of Materials Science, Tohoku University, Sendai 980-8579, Japan
Shoma Arai: Department of Electrical Engineering and Information Systems, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Shingo Kaneta-Takada: Department of Electrical Engineering and Information Systems, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Le Duc Anh: Department of Electrical Engineering and Information Systems, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Shutaro Karube: Department of Materials Science, Tohoku University, Sendai 980-8579, Japan
Makoto Kohda: Department of Materials Science, Tohoku University, Sendai 980-8579, Japan
Shinobu Ohya: Department of Electrical Engineering and Information Systems, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Junsaku Nitta: Department of Materials Science, Tohoku University, Sendai 980-8579, Japan

DOI: https://doi.org/10.1063/5.0023282
Journal volume & issue: Vol. 10, no. 10
pp. 105010 – 105010-6

Abstract

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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.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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