Header

UZH-Logo

Maintenance Infos

Top‐Layer Engineering Reshapes Charge Transfer at Polar Oxide Interfaces


De Luca, Gabriele; Spring, Jonathan; Kaviani, Moloud; Jöhr, Simon; Campanini, Marco; Zakharova, Anna; Guillemard, Charles; Herrero‐Martin, Javier; Erni, Rolf; Piamonteze, Cinthia; Rossell, Marta D; Aschauer, Ulrich; Gibert, Marta (2022). Top‐Layer Engineering Reshapes Charge Transfer at Polar Oxide Interfaces. Advanced Materials, 34(36):2203071.

Abstract

Charge-transfer phenomena at heterointerfaces are a promising pathway to engineer functionalities absent in bulk materials but can also lead to degraded properties in ultrathin films. Mitigating such undesired effects with an interlayer reshapes the interface architecture, restricting its operability. Therefore, developing less-invasive methods to control charge transfer will be beneficial. Here, an appropriate top-interface design allows for remote manipulation of the charge configuration of the buried interface and concurrent restoration of the ferromagnetic trait of the whole film. Double-perovskite insulating ferromagnetic La2NiMnO6 (LNMO) thin films grown on perovskite oxide substrates are investigated as a model system. An oxygen-vacancy-assisted electronic reconstruction takes place initially at the LNMO polar interfaces. As a result, the magnetic properties of 2–5 unit cell LNMO films are affected beyond dimensionality effects. The introduction of a top electron-acceptor layer redistributes the electron excess and restores the ferromagnetic properties of the ultrathin LNMO films. Such a strategy can be extended to other interfaces and provides an advanced approach to fine-tune the electronic features of complex multilayered heterostructures.

Abstract

Charge-transfer phenomena at heterointerfaces are a promising pathway to engineer functionalities absent in bulk materials but can also lead to degraded properties in ultrathin films. Mitigating such undesired effects with an interlayer reshapes the interface architecture, restricting its operability. Therefore, developing less-invasive methods to control charge transfer will be beneficial. Here, an appropriate top-interface design allows for remote manipulation of the charge configuration of the buried interface and concurrent restoration of the ferromagnetic trait of the whole film. Double-perovskite insulating ferromagnetic La2NiMnO6 (LNMO) thin films grown on perovskite oxide substrates are investigated as a model system. An oxygen-vacancy-assisted electronic reconstruction takes place initially at the LNMO polar interfaces. As a result, the magnetic properties of 2–5 unit cell LNMO films are affected beyond dimensionality effects. The introduction of a top electron-acceptor layer redistributes the electron excess and restores the ferromagnetic properties of the ultrathin LNMO films. Such a strategy can be extended to other interfaces and provides an advanced approach to fine-tune the electronic features of complex multilayered heterostructures.

Statistics

Citations

Dimensions.ai Metrics
8 citations in Web of Science®
9 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

6 downloads since deposited on 07 Feb 2023
2 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Materials Science
Physical Sciences > Mechanics of Materials
Physical Sciences > Mechanical Engineering
Uncontrolled Keywords:Mechanical Engineering, Mechanics of Materials, General Materials Science
Language:English
Date:1 September 2022
Deposited On:07 Feb 2023 16:18
Last Modified:28 Jun 2024 01:38
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:0935-9648
OA Status:Green
Publisher DOI:https://doi.org/10.1002/adma.202203071
PubMed ID:35841137
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)