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Journal Article

Charge Transfer Control of Emergent Magnetism at SrMnO3/LaMnO3Interfaces

Authors

Bange,  Jan Philipp
External Organizations;

/persons/resource/roddatis

Roddatis,  Vladimir
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Schüler,  Leonard
External Organizations;

Lyzwa,  Fryderyk
External Organizations;

Keunecke,  Marius
External Organizations;

Lopatin,  Sergei
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Bruchmann‐Bamberg,  Vitaly
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Moshnyaga,  Vasily
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5014581.pdf
(Publisher version), 3MB

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Citation

Bange, J. P., Roddatis, V., Schüler, L., Lyzwa, F., Keunecke, M., Lopatin, S., Bruchmann‐Bamberg, V., Moshnyaga, V. (2022): Charge Transfer Control of Emergent Magnetism at SrMnO3/LaMnO3Interfaces. - Advanced Materials Interfaces, 9, 34, 2201282.
https://doi.org/10.1002/admi.202201282


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014581
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.