High-TC Interfacial Ferromagnetism in SrMnO3/LaMnO3 Superlattices

Marius Keunecke, Fryderyk Lyzwa, Danny Schwarzbach, Vladimir Roddatis, Nicolas Gauquelin, Knut Müller-Caspary, Johann Verbeeck, Sara J. Callori, Frank Klose, Markus Jungbauer, Vasily Moshnyaga*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Heterostructures of strongly correlated oxides demonstrate various intriguing and potentially useful interfacial phenomena. LaMnO3/SrMnO3 superlattices are presented showcasing a new high-temperature ferromagnetic phase with Curie temperature, TC ≈360 K, caused by electron transfer from the surface of the LaMnO3 donor layer into the neighboring SrMnO3 acceptor layer. As a result, the SrMnO3 (top)/LaMnO3 (bottom) interface shows an enhancement of the magnetization as depth-profiled by polarized neutron reflectometry. The length scale of charge transfer, λTF ≈2 unit cells, is obtained from in situ growth monitoring by optical ellipsometry, supported by optical simulations, and further confirmed by high resolution electron microscopy and spectroscopy. A model of the inhomogeneous distribution of electron density in LaMnO3/SrMnO3 layers along the growth direction is concluded to account for a complex interplay between ferromagnetic and antiferromagnetic layers in superlattices.

Original languageEnglish
Article number1808270
JournalAdvanced Functional Materials
Volume30
Issue number18
DOIs
StatePublished - 1 May 2020

Keywords

  • charge transfer
  • interfaces
  • interfacial ferromagnetism
  • oxide superlattices

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