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Study of Rashba Spin–Orbit Field at LaAlO3/SrTiO3 Heterointerfaces

  • 5th International Conference of Asian Union of Magnetics Societies
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Abstract

Oxide interfaces such as LaAlO3/SrTiO3 (LAO/STO) are interesting platforms for the investigation of ‘spin–orbitronics’ because of their strongly coupled spin and orbital degrees of freedom due to the inversion asymmetry of the structure. In this investigation, we demonstrate a tunable Rashba spin–orbit field at the LAO/STO interface via the application of an external gate electric field. The strength of the Rashba field was indirectly estimated by measuring the planar angle dependence of the anisotropic magnetoresistance (AMR). The asymmetry of the planar AMR between θ = 0 and π indicates the existence of Rashba spin–orbit fields, which are tunable by adjusting the current density and gate electric field. From the AMR measurements, the effective Rashba field exhibits up to 4 T for the application of an external back-gate voltage of 30 V. This controllable and relatively high Rashba field suggests that the LAO/STO is an attractive 2-D interface for potential spin–orbitronic applications, such as spin-charge converters, spin-FETs, and spin–orbit torque devices.

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Acknowledgments

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (2017R1A6A3A01012106). This research was also funded by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Science and ICT (2017R1A2B4008286 and 2017M3A7B4049172).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea

    Mi-Jin Jin, Daeseong Choe, Jungmin Park, Vijayakumar Modepalli, Junhyeon Jo, Inseon Oh & Jung-Woo Yoo

  2. Center for Electronic Materials, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea

    Shin-Ik Kim, Seon Young Moon & Seung-Hyub Baek

  3. Division of Nano and Information Technology, KIST School, Korea University of Science and Technology, Seoul, 02792, Republic of Korea

    Seung-Hyub Baek

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  1. Mi-Jin Jin
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Jin, MJ., Kim, SI., Moon, S.Y. et al. Study of Rashba Spin–Orbit Field at LaAlO3/SrTiO3 Heterointerfaces. J. Electron. Mater. 48, 1347–1352 (2019). https://doi.org/10.1007/s11664-018-6788-2

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