Top-layer engineering reshapes charge transfer at polar oxide interfaces
De Luca, Gabriele (Institut Català de Nanociència i Nanotecnologia)
Spring, Jonathan (University of Zurich. Department of Physics)
Kaviani, Moloud (University of Bern. Department of Chemistry, Biochemistry and Pharmaceutical Sciences)
Jöhr, Simon (University of Zurich. Department of Physics)
Campanini, Marco (Swiss Federal Laboratories for Materials Science and Technology)
Zakharova, Anna (Paul Scherrer Institut (Suïssa))
Guillemard, Charles (ALBA Laboratori de Llum de Sincrotró)
Herrero-Martín, Javier (ALBA Laboratori de Llum de Sincrotró)
Erni, Rolf (Swiss Federal Laboratories for Materials Science and Technology)
Piamonteze, Cinthia (Paul Scherrer Institut (Suïssa))
Rossell, Marta D. (Swiss Federal Laboratories for Materials Science and Technology)
Aschauer, Ulrich (University of Bern. Department of Chemistry, Biochemistry and Pharmaceutical Sciences)
Gibert, Marta (TU Wien. Institute of Solid State Physics)

Data:	2022
Resum:	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 LaNiMnO (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.
Nota:	Altres ajuts: Open access funding provided by Universitat Zurich.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Charge-transfer phenomena ; Double perovskites ; Ferromagnetism ; Oxide interfaces
Publicat a:	Advanced materials, Vol. 34, issue 36 (Sep. 2022) , art. 2203071, ISSN 1521-4095

DOI: 10.1002/adma.202203071

9 p, 3.6 MB

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