Depth-resolved profile of the interfacial ferromagnetism in CaMnO<sub>3</sub>/CaRuO<sub>3</sub> superlattices.

ORAL

Abstract

Emergent magnetic phenomena at interfaces are crucial for advancing spintronics and magnetic storage technologies. Here, we employ advanced X-ray spectroscopic and scattering techniques to explore interfacial ferromagnetism in oxide superlattices of antiferromagnetic CaMnO3 and paramagnetic CaRuO3. We show that ferromagnetism extends beyond the interfacial layer into multiple CaMnO3 unit cells with an asymmetric magnetic profile. Density functional calculations suggest this is driven by double exchange via charge transfer from Ru to Mn ions. Additionally, oxygen vacancies influence the magnetic moments at the interface, contributing to the asymmetry. These findings highlight the potential for tuning interfacial ferromagnetism through defect engineering.

*The authors acknowledge support from the US Air Force Office of Scientific Research (AFOSR) under award number FA9550-23-1-0476.

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Publication: J. R. Paudel, A. Mansouri Tehrani, M. Terilli, M. Kareev, J. Grassi, R. K. Sah, L. Wu, V. N. Strocov, C. Klewe, P. Shafer, J. Chakhalian, N. A. Spaldin, and A. X. Gray, Depth-resolved profile of the interfacial ferromagnetism in CaMnO3/CaRuO3 superlattices, arXiv:2405.01445 (2024).

Presenters

  • Jay R Paudel

    • Lawrence Berkeley National Laboratory
    • Temple University, Lawrence Berkeley National Laboratory

Authors

  • Jay R Paudel

    • Lawrence Berkeley National Laboratory
    • Temple University, Lawrence Berkeley National Laboratory

  • Aria Mansouri Tehrani

    • ETH Zurich

  • Michael Terilli

    • Rutgers University

  • Mikhail Kareev

    • Rutgers University

  • Joseph D Grassi

    • Temple University

  • Raj K Sah

    • Temple University

  • Liang Wu

    • Rutgers University

  • Vladimir N Strocov

    • PSI
    • Photon Science Division, Paul Scherrer Institute
    • Paul Scherrer Institute
    • Swiss Light Source, Photon Science Division, Paul Scherrer Institute, Villigen, Switzerland

  • Christoph Klewe

    • Lawrence Berkeley National Laboratory

  • Padraic Shafer

    • Lawrence Berkeley National Laboratory

  • Jak Chakhalian

    • Rutgers University

  • Nicola A. Spaldin

    • ETH Zurich

  • Alexander X Gray

    • Temple University