Polarization Screening Mechanisms at La0.7Sr0.3MnO3-PbTiO3 Interfaces

Jonathan J P Peters; Nicholas C Bristowe; Dorin Rusu; Geanina Apachitei; Richard Beanland; Marin Alexe; Ana M Sanchez

doi:10.1021/acsami.9b21619

Polarization Screening Mechanisms at La_0.7Sr_0.3MnO₃-PbTiO₃ Interfaces

ACS Appl Mater Interfaces. 2020 Mar 4;12(9):10657-10663. doi: 10.1021/acsami.9b21619. Epub 2020 Feb 24.

Authors

Jonathan J P Peters¹, Nicholas C Bristowe², Dorin Rusu¹, Geanina Apachitei¹, Richard Beanland¹, Marin Alexe¹, Ana M Sanchez¹

Affiliations

¹ Department of Physics, University of Warwick, Coventry CV4 7AL, U.K.
² School of Physical Sciences, University of Kent, Canterbury CT2 7NH, U.K.

PMID: 32028760
DOI: 10.1021/acsami.9b21619

Abstract

The structural, electronic, and magnetic properties of interfaces between epitaxial La_0.7Sr_0.3MnO₃ and PbTiO₃ have been explored via atomic resolution transmission electron microscopy of a functional multiferroic tunnel junction. Measurements of the polar displacements and octahedral tilting show the competition between the two distortions at the interface and demonstrate strong dependence on the polarization orientation. The density functional theory provides information on the electronic and magnetic properties, where the interface termination plays a crucial role in the screening mechanisms.

Keywords: density functional theory; ferroelectric polarization screening; metal−ferroelectric interface; quantitative transmission electron microscopy; tunnel junctions.