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

  • Mi-Jin Jin
  • Shin-Ik Kim
  • Seon Young Moon
  • Daeseong Choe
  • Jungmin Park
  • Vijayakumar Modepalli
  • Junhyeon Jo
  • Inseon Oh
  • Seung-Hyub Baek
  • Jung-Woo Yoo
5th International Conference of Asian Union of Magnetics Societies
  • 17 Downloads
Part of the following topical collections:
  1. 5th International Conference of Asian Union of Magnetics Societies (IcAUMS)

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.

Keywords

LAO/STO conductive oxide interface Rashba spin–orbit interaction spin–orbitronics oxide spintronics 

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Notes

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).

Conflict of interest

The authors declare no competing financial interest.

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringUlsan National Institute of Science and TechnologyUlsanRepublic of Korea
  2. 2.Center for Electronic MaterialsKorea Institute of Science and TechnologySeoulRepublic of Korea
  3. 3.Division of Nano and Information Technology, KIST SchoolKorea University of Science and TechnologySeoulRepublic of Korea

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