TY - JOUR
T1 - Charge Transfer Control of Emergent Magnetism at SrMnO3/LaMnO3 Interfaces
AU - Bange, Jan Philipp
AU - Roddatis, Vladimir
AU - Schüler, Leonard
AU - Lyzwa, Fryderyk
AU - Keunecke, Marius
AU - Lopatin, Sergei
AU - Bruchmann-Bamberg, Vitaly
AU - Moshnyaga, Vasily
N1 - KAUST Repository Item: Exported on 2022-10-06
Acknowledgements: This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – 217133147/SFB 1073, projects A02, Z02. F.L. acknowledges support from the Swiss National Science Foundation through an Early Postdoc.Mobility Fellowship with Project No. P2FRP2-199598.
PY - 2022/10/3
Y1 - 2022/10/3
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/682239
UR - https://onlinelibrary.wiley.com/doi/10.1002/admi.202201282
U2 - 10.1002/admi.202201282
DO - 10.1002/admi.202201282
M3 - Article
SN - 2196-7350
SP - 2201282
JO - Advanced Materials Interfaces
JF - Advanced Materials Interfaces
ER -