The emergence of magnetic ordering at complex oxide interfaces tuned by defects
Artikel i vetenskaplig tidskrift, 2020
Complex oxides show extreme sensitivity to structural distortions and defects, and the intricate balance of competing interactions which emerge at atomically defined interfaces may give rise to unexpected physics. In the interfaces of non-magnetic complex oxides, one of the most intriguing properties is the emergence of magnetism which is sensitive to chemical defects. Particularly, it is unclear which defects are responsible for the emergent magnetic interfaces. Here, we show direct and clear experimental evidence, supported by theoretical explanation, that the B-site cation stoichiometry is crucial for the creation and control of magnetism at the interface between non-magnetic ABO3-perovskite oxides, LaAlO3 and SrTiO3. We find that consecutive defect formation, driven by atomic charge compensation, establishes the formation of robust perpendicular magnetic moments at the interface. Our observations propose a route to tune these emerging magnetoelectric structures, which are strongly coupled at the polar-nonpolar complex oxide interfaces.
Författare
D. S. Park
Ecole Polytechnique Federale de Lausanne (EPFL)
A. D. Rata
Martin-Luther-Universität Halle-Wittenberg
I. V. Maznichenko
Martin-Luther-Universität Halle-Wittenberg
S. Ostanin
Martin-Luther-Universität Halle-Wittenberg
Y. L. Gan
Danmarks Tekniske Universitet (DTU)
S. Agrestini
Diamond Light Source
El Sincrotrón ALBA
G. J. Rees
University of Oxford
M. Walker
The University of Warwick
J. Li
Ecole Polytechnique Federale de Lausanne (EPFL)
J. Herrero-Martin
El Sincrotrón ALBA
Gyanendra Singh
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Z. Luo
The University of Warwick
A. Bhatnagar
Martin-Luther-Universität Halle-Wittenberg
Zentrum für Innovationskompetenz SiLi-nano
Y. Z. Chen
Danmarks Tekniske Universitet (DTU)
V. Tileli
Ecole Polytechnique Federale de Lausanne (EPFL)
P. Muralt
Ecole Polytechnique Federale de Lausanne (EPFL)
Alexei Kalaboukhov
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
I. Mertig
Martin-Luther-Universität Halle-Wittenberg
K. Dorr
Martin-Luther-Universität Halle-Wittenberg
A. Ernst
Max-Planck-Gesellschaft
Johannes Kepler Universität Linz (JKU)
N. Pryds
Danmarks Tekniske Universitet (DTU)
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 11 1 3650Ämneskategorier
Oorganisk kemi
Fysikalisk kemi
Den kondenserade materiens fysik
DOI
10.1038/s41467-020-17377-0
PubMed
32686663