Spin-orbit coupling and local magnetism at a complex oxide interface

 · Invited

Abstract

SrTiO3-based thin-film heterostructures are a powerful platform for studying a wide array of electronic phases in two dimensions, at high carrier densities. This talk will discuss low-temperature electronic transport studies of NdTiO3/SrTiO3 interfaces, which reveal local ferromagnetic order and strong spin-orbit interaction. As the magnetic field angle is gradually tilted away from the sample normal, the data reveals an intriguing interplay between strong k-cubic Rashba-type spin-orbit coupling and a substantial magnetic exchange interaction from local magnetic regions. The resulting quantum corrections to the conduction are in excellent agreement with existing models and allow sensitive determination of the small magnetic moments (22 µB on average), their magnetic anisotropy and mutual coupling strength. This effect is expected to arise in other 2D magnetic materials systems and could provide a simple yet powerful tool for investigating local magnetism.

Reference: Xinxin Cai, Yilikal Ayino, Jin Yue, Peng Xu, Bharat Jalan, and Vlad S. Pribiag, Phys. Rev. B 100, 081402(R) (2019).

*This work was supported primarily by the Office of Naval Research under Award No. N00014-17-1-2884. Film growth and structural characterizations were funded by the U.S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC-0016371. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) under Award No. ECCS-1542202. Sample structural characterization was carried out at the University of Minnesota Characterization Facility, which receives partial support from NSF through theMRSEC program under Award No.DMR-1420013.

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Presenters

  • Vlad Pribiag

    • University of Minnesota
    • School pf Physics and Astronomy, University of Minnesota
    • School of Physics and Astronomy, University of Minnesota

Authors

  • Vlad Pribiag

    • University of Minnesota
    • School pf Physics and Astronomy, University of Minnesota
    • School of Physics and Astronomy, University of Minnesota