%0 Journal Article
%A Keunecke, Marius
%A Lyzwa, Fryderyk
%A Schwarzbach, Danny
%A Roddatis, Vladimir
%A Gauquelin, Nicolas
%A Müller‐Caspary, Knut
%A Verbeeck, Johann
%A Callori, Sara J.
%A Klose, Frank
%A Jungbauer, Markus
%A Moshnyaga, Vasily
%T High‐ T C Interfacial Ferromagnetism in SrMnO 3 /LaMnO 3 Superlattices
%J Advanced functional materials
%V 30
%N 18
%@ 1616-3028
%C Weinheim
%I Wiley-VCH
%M FZJ-2020-02742
%P 1808270
%D 2020
%X 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, T C ≈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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000535358900008
%R 10.1002/adfm.201808270
%U https://juser.fz-juelich.de/record/878279