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Polarization Screening Mechanisms at La0.7Sr0.3MnO3-PbTiO3 Interfaces
Jonathan J P Peters1, Nicholas C Bristowe2, Dorin Rusu1
1Department of Physics, University of Warwick, Coventry CV4 7AL, U.K.
ACS Applied Materials & Interfaces
|February 8, 2020
Summary
Investigating interfaces between lanthanum strontium manganite and lead titanate in multiferroic tunnel junctions reveals how structural distortions and electronic properties depend on polarization. Interface termination is key to screening mechanisms in these advanced materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid-State Chemistry
Background:
- Multiferroic tunnel junctions (MTJs) offer potential for novel electronic devices.
- Understanding interfacial effects in complex oxide heterostructures is crucial for device optimization.
- Epitaxial La0.7Sr0.3MnO3 (LSMO) and PbTiO3 (PTO) are key materials in multiferroic research.
Purpose of the Study:
- To explore the structural, electronic, and magnetic properties at the interface of LSMO/PTO heterostructures.
- To investigate the influence of polarization orientation on interfacial distortions.
- To elucidate the role of interface termination in electronic screening mechanisms.
Main Methods:
- Atomic resolution transmission electron microscopy (ARTEM) was used to analyze structural properties.
- Density functional theory (DFT) calculations were employed to study electronic and magnetic characteristics.
- Functional multiferroic tunnel junction devices were fabricated and characterized.
Main Results:
- ARTEM revealed competition between polar displacements and octahedral tilting at the LSMO/PTO interface.
- Interfacial distortions showed strong dependence on the polarization orientation of PTO.
- DFT calculations indicated that interface termination significantly impacts electronic screening.
Conclusions:
- The interplay of structural distortions at the LSMO/PTO interface is highly sensitive to polarization.
- Interface termination is a critical factor governing electronic properties and screening in these MTJs.
- These findings provide insights for designing next-generation multiferroic memory and logic devices.
