Interfacial control of chiral magnetic interactions and Hall effect in Iridate-manganite superlattices

 · Invited

Abstract

One of the most intriguing outcomes of symmetry breaking and spin-obit interactions in magnetic systems is the possibility to create non-collinear and chiral spin textures. The Dzyaloshinskii-Moriya interaction (DMI) results from strong spin-orbit coupling and broken inversion symmetry to generate magnetization rotations with fixed chirality. The discovery of magnetic skyrmions originating from strong DMI in metal thin films has led to an explosion of efforts to manipulate magnetic phases originating from interfaces. I will describe our progress to understand interface-induced magnetism in epitaxial 3d/5d iridate/manganite superlattices. Our previous work on high-quality epitaxially stabilized SrMnO3/SrIrO3 superlattices revealed charge-transfer induced interfacial collinear ferromagnetism and an anomalous Hall effect [1,2]. In LaMnO3/SrIrO3 superlattices, we find a large additional topological Hall effect arising from the interaction of charge carriers with a noncoplanar chiral spin texture induced by interfacial DMI [3]. I will describe how the interfacial atomic layer stacking and symmetry enabled by the nonmagnetic A-sites determine the competition between collinear and chiral magnetic interactions originating from the oxide interface. These results will be compared with magnetometry measurements, soft and hard x-ray experiments, which provide a comparison of the bulk and interface electronic and magnetic properties. Our findings provide insight to the manipulation of chiral magnetism from atomic-scale control of DMI at oxide interfaces.

[1] J. Nichols et al., Nat. Commun. 7, 12721 (2016).
[2] S. Okamoto et al., Nano Lett. 17, 2126 (2017).
[3] P. Bruno et al., Phys. Rev. Lett. 93, 096806 (2004).

*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • Elizabeth Skoropata

    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

Authors

  • Elizabeth Skoropata

    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • John A Nichols

    • Oak Ridge National Lab

  • Jong Mok Ok

    • Oak Ridge National Lab

  • Rajesh V Chopdekar

    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Eun Sang Choi

    • Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA
    • National High Field Magnet Laboratory
    • National High Magnetic Field Laboratory
    • Florida State University
    • National High Magnetic Field Laboratory, Florida State University
    • National High Magnetic Field Lab

  • Ankur Rastogi

    • Oak Ridge National Lab

  • Changhee Sohn

    • Department of Physics, Ulsan National Institute of Science and Technology
    • UNIST
    • Oak Ridge National Lab

  • Xiang Gao

    • Oak Ridge National Lab

  • Thomas Farmer

    • Oak Ridge National Lab

  • Ryan Desautels

    • Oak Ridge National Lab
    • Seagate Technology

  • Yongseong Choi

    • Argonne National Laboratory
    • Argonne National Lab
    • Advanced Photon Source, Argonne National Laboratory

  • Daniel Haskel

    • Advanced Photon Source, Argonne National Laboratory
    • Argonne National Laboratory
    • Argonne National Lab

  • John William Freeland

    • Advanced Photon Source, Argonne National Lab
    • Argonne National Lab
    • Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory

  • Satoshi Okamoto

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

  • Matthew Brahlek

    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Lab

  • Ho Nyung Lee

    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory