High‐ TC interfacial ferromagnetism in SrMnO 3 LaMnO 3 superlattices

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

doi:10.1002/adfm.201808270

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High‐ T_C interfacial ferromagnetism in SrMnO ₃ LaMnO ₃ superlattices

Keunecke, Marius Erstes Physikalisches Institut, Georg‐August‐Universität‐Göttingen Friedrich‐Hund‐Platz 1 37077 Göttingen Germany
Lyzwa, Fryderyk Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg Chemin du Musée 3 CH‐1700 Fribourg Switzerland
Schwarzbach, Danny Erstes Physikalisches Institut, Georg‐August‐Universität‐Göttingen Friedrich‐Hund‐Platz 1 37077 Göttingen Germany - Institut für Materialphysik, Georg‐August‐Universität‐Göttingen Friedrich‐Hund‐Platz 1 37077 Göttingen Germany
Roddatis, Vladimir Institut für Materialphysik, Georg‐August‐Universität‐Göttingen Friedrich‐Hund‐Platz 1 37077 Göttingen Germany
Gauquelin, Nicolas EMATUniversity of Antwerp Groenenborgerlaan 171 2020 Antwerp Belgium
Müller‐Caspary, Knut EMATUniversity of Antwerp Groenenborgerlaan 171 2020 Antwerp Belgium
Verbeeck, Johann EMATUniversity of Antwerp Groenenborgerlaan 171 2020 Antwerp Belgium
Callori, Sara J. Australian Centre for Neutron Scattering, ANSTO New Illawarra Road Lucas Heights NSW 2234 Australia - Department of Physics, California State University San Bernardino CA 92407 USA
Klose, Frank Australian Centre for Neutron Scattering, ANSTO New Illawarra Road Lucas Heights NSW 2234 Australia - Guangdong Technion‐Israel Institute of Technology 241 Da Xue Road Shantou 515063 P. R. China
Jungbauer, Markus Erstes Physikalisches Institut, Georg‐August‐Universität‐Göttingen Friedrich‐Hund‐Platz 1 37077 Göttingen Germany
Moshnyaga, Vasily Erstes Physikalisches Institut, Georg‐August‐Universität‐Göttingen Friedrich‐Hund‐Platz 1 37077 Göttingen Germany

05.02.2020

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Advanced Functional Materials. - 2020, vol. 30, no. 18, p. 1808270

English 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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language