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Published on: May 13, 2020
Resistive Switching in All-Oxide Ferroelectric Tunnel Junctions with Ionic Interfaces.
Qi Hang Qin1, Laura Äkäslompolo1, Noora Tuomisto2
1NanoSpin, Department of Applied Physics, Aalto University School of Science, P.O. Box, 15100, FI-00076, Aalto, Finland.
Giant resistive switching in oxide tunnel junctions using ferroelectric and paraelectric barriers is demonstrated. This effect, driven by electric fields and oxygen vacancy migration, is efficient even at low temperatures.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid-State Electronics
Background:
- Resistive switching phenomena are crucial for next-generation electronic devices.
- Oxide tunnel junctions offer tunable electronic properties.
- Ferroelectric and paraelectric materials present unique opportunities for memory applications.
Purpose of the Study:
- To demonstrate universal, giant, and nonvolatile resistive switching in oxide tunnel junctions.
- To investigate the role of ferroelectric and paraelectric tunnel barriers in resistive switching.
- To understand the underlying mechanism of the observed switching behavior.
Main Methods:
- Fabrication of oxide tunnel junctions using ferroelectric (PbZr0.2Ti0.8O3, BaTiO3) and paraelectric (SrTiO3) tunnel barriers.
- Electrical characterization of resistive switching behavior under varying electric fields.
- Analysis of the switching mechanism involving oxygen vacancy migration.
Main Results:
- Demonstrated universal, giant, and nonvolatile resistive switching across different oxide tunnel barrier materials.
- Identified reversible migration of oxygen vacancies between the tunnel barrier and La2/3Sr1/3MnO3 electrode as the switching mechanism.
- Confirmed efficient switching performance down to 5 K.
Conclusions:
- Oxide tunnel junctions with ferroelectric and paraelectric barriers exhibit robust resistive switching.
- Oxygen vacancy migration is a key mechanism for achieving high-performance resistive switching devices.
- The demonstrated effect holds promise for low-temperature electronic applications.
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