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

doi:10.1002/adfm.201808270

High-T_C 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 journal › Article › peer-review

11 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, 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, λ_TF ≈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 language	English
Article number	1808270
Journal	Advanced Functional Materials
Volume	30
Issue number	18
DOIs	https://doi.org/10.1002/adfm.201808270
State	Published - 1 May 2020
Externally published	Yes

Keywords

charge transfer
interfaces
interfacial ferromagnetism
oxide superlattices

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10.1002/adfm.201808270

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title = "High-TC Interfacial Ferromagnetism in SrMnO3/LaMnO3 Superlattices",

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.",

keywords = "charge transfer, interfaces, interfacial ferromagnetism, oxide superlattices",

author = "Marius Keunecke and Fryderyk Lyzwa and Danny Schwarzbach and Vladimir Roddatis and Nicolas Gauquelin and Knut M{\"u}ller-Caspary and Johann Verbeeck and Callori, {Sara J.} and Frank Klose and Markus Jungbauer and Vasily Moshnyaga",

note = "Publisher Copyright: {\textcopyright} 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2020",

month = may,

day = "1",

doi = "10.1002/adfm.201808270",

language = "英语",

volume = "30",

journal = "Advanced Functional Materials",

issn = "1616-301X",

publisher = "Wiley-VCH Verlag",

number = "18",

}

High-T_C Interfacial Ferromagnetism in SrMnO₃/LaMnO₃ 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.

In: Advanced Functional Materials, Vol. 30, No. 18, 1808270, 01.05.2020.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - High-TC Interfacial Ferromagnetism in SrMnO3/LaMnO3 Superlattices

AU - Keunecke, Marius

AU - Lyzwa, Fryderyk

AU - Schwarzbach, Danny

AU - Roddatis, Vladimir

AU - Gauquelin, Nicolas

AU - Müller-Caspary, Knut

AU - Verbeeck, Johann

AU - Callori, Sara J.

AU - Klose, Frank

AU - Jungbauer, Markus

AU - Moshnyaga, Vasily

PY - 2020/5/1

Y1 - 2020/5/1

N2 - 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.

AB - 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.

KW - charge transfer

KW - interfaces

KW - interfacial ferromagnetism

KW - oxide superlattices

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U2 - 10.1002/adfm.201808270

DO - 10.1002/adfm.201808270

M3 - 文章

AN - SCOPUS:85061376169

VL - 30

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

IS - 18

M1 - 1808270

ER -

High-T_C Interfacial Ferromagnetism in SrMnO₃/LaMnO₃ Superlattices

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