Evolution of ferromagnetism in two-dimensional electron gas of LaTiO3/SrTiO3

ORAL

Abstract

Despite almost one-decade-long research effort, the microscopic origin of ferromagnetism in LaAlO3/SrTiO3 is still an open question. Here we report the antiferromagnetic affected two-dimensional electron gas (2DEG) on the interface between antiferromagnetic Mott insulator LaAlO3 and non-magnetic band insulator SrTiO3. The clear two-dimensional reflection high-energy electron diffraction (RHEED) pattern and X-ray photoelectron spectroscopy confirm the crystal structure and chemical composition, while the negative correlation between temperature and resistivity in low temperature shows the existence of magnetic islands. The observation of clear hysteresis in magnetotransport at low magnetic fields (~ 2 T) shows the effect of canted magnetic islands in the hole-rich LaAlO3 near the interface. Our result provides another path for designing all-oxide structures and is relevant to spintronics applications.

*F. W. was supported by the Claud Lovelace Graduate Fellowship. Y. C. acknowledged the Gordon and Betty Moore Foundations’ EPIQS Initiative through ICAM-I2CAM, Grant GBMF5305. X. L. was supported by the Department of Energy Grant No. DE-SC0012375. J. C. acknowledged the support by the Gordon and Betty Moo

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Presenters

  • Fangdi Wen

    • Department of Physics, Rutgers Univ
    • Physics and Astronomy, Rutgers University

Authors

  • Fangdi Wen

    • Department of Physics, Rutgers Univ
    • Physics and Astronomy, Rutgers University

  • Yanwei Cao

    • Rutgers University
    • Department of Physics & Astronomy, Rutgers the State Univ of NJ New Brunswick
    • Department of Physics, Ningbo Institute of Materials Technology and Engineering

  • Xiaoran Liu

    • Department of Physics, Rutgers Univ
    • Physics and Astronomy, Rutgers University

  • Banabir Pal

    • Department of Physics & Astronomy, Rutgers the State Univ of NJ New Brunswick
    • Department of Physics, Rutgers Univ
    • Physics and Astronomy, Rutgers University

  • Srimanta Middey

    • Department of Physics, Indian Institute of Science

  • Mikhail Kareev

    • Rutgers University
    • Department of Physics, Rutgers Univ
    • Physics and Astronomy, Rutgers University

  • Jak Chakhalian

    • Rutgers University
    • Department of Physics & Astronomy, Rutgers the State Univ of NJ New Brunswick
    • Department of Physics, Rutgers Univ
    • Physics and Astronomy, Rutgers University