Charge Transfer Control of Emergent Magnetism at SrMnO3/LaMnO3 Interfaces

Jan Philipp Bange, Vladimir Roddatis, Leonard Schüler, Fryderyk Lyzwa, Marius Keunecke, Sergei Lopatin, Vitaly Bruchmann-Bamberg, Vasily Moshnyaga

    Research output: Contribution to journalArticlepeer-review

    1 Scopus citations

    Abstract

    Emergent phases at the interfaces in strongly correlated oxide heterostructures display novel properties not akin to those of constituting materials. The interfacial ferromagnetism in (LaMnO3)m/(SrMnO3)n (LMO)m/(SMO)n superlattices (SLs) with antiferromagnetic bulk LMO and SMO layers is believed to be a result of the interfacial charge transfer (CT). By using in situ optical ellipsometry, it is demonstrated directly that CT and emergent magnetism in (LMO)m/(SMO)n SLs are controlled by the LMO/SMO thickness ratio, chosen as m/n = 1 and 2. The enhanced CT in SLs with m/n = 2 favors the high-TC emergent ferromagnetism with TC = 350–360 K, whereas the reduced CT in m/n = 1 SLs suppresses it yielding TC = 300 K. A complex dependence of the saturation magnetization as a function of interface density Λ = (m + n)−1 with minima at Λ = 0.11 (m/n = 2) and Λ = 0.25 (m/n = 1) was observed and rationalized by the competition of ferromagnetic and antiferromagnetic contributions, originating from the volume of LMO and SMO layers as well as from the LMO/SMO interfaces. The role of epitaxy stress and MnO6 octahedral tilts in the emergent magnetic behavior is discussed.
    Original languageEnglish (US)
    Pages (from-to)2201282
    JournalAdvanced Materials Interfaces
    DOIs
    StatePublished - Oct 3 2022

    Bibliographical note

    KAUST Repository Item: Exported on 2022-10-06
    Acknowledgements: This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – 217133147/SFB 1073, projects A02, Z02. F.L. acknowledges support from the Swiss National Science Foundation through an Early Postdoc.Mobility Fellowship with Project No. P2FRP2-199598.

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering

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