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Theoretical investigations of Topological Hall Effect at Manganite/Iridate Oxide Interfaces

ORAL

Abstract

We study topological Hall effect at the interface between La1−xSrxMnO3 and SrIrO3. We show that the ferromagnetism at the manganite layer, in conjunction with the Dzyaloshinskii-Moriya (DM) interaction which arises at the interface due to broken inversion symmetry and strong spin-orbit coupling from the iridate layer produces a skyrmion crystal (SkX) phase in the presence of an external magnetic field. Using the Monte Carlo technique and a two-orbital spin-fermion model for manganites, we obtain phase diagrams which reveal, at low temperatures, a clear SkX phase and also a low-field spin-spiral phase. Increasing temperature, a skyrmion-gas phase, precursor of the SkX phase upon cooling, was identified. The topological Hall effect primarily appears in the SkX phase. We also show that a planar topological Hall effect can robustly appear at oxide interfaces from conical spin spirals at oxide interfaces, without skyrmions, when the magnetic field is applied parallel to the interface plane.

[1] N. Mohanta, E. Dagotto and S. Okamoto, Phys. Rev. B 100, 064429 (2019)
[2] N. Mohanta, S. Okamoto and E. Dagotto, in preparation.

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Presenters

  • Narayan Mohanta

    Oak Ridge National Lab

Authors

  • Narayan Mohanta

    Oak Ridge National Lab

  • Elbio Dagotto

    Department of Physics and Astronomy, University of Tennessee and ORNL, Physics Department, University of Tennessee, University of Tennessee, Department of Physics and Astronomy, University of Tennessee at Knoxville, University of Tennessee, Knoxville, and Oak Ridge National Laboratory, University of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee

  • Satoshi Okamoto

    Oak Ridge National Lab, Materials Science and Technology Division, Oak Ridge National Laboratory, University of Tennessee, Knoxville, Oak Ridge National Laboratory