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Voltage-polarity dependent multi-mode resistive switching on sputtered MgO nanostructures
Catarina Dias1, Luís M Guerra, Bernardo D Bordalo
1IFIMUP-IN and Department of Physics and Astronomy, Faculty of Sciences, Porto, Portugal. joventur@fc.up.pt.
Physical Chemistry Chemical Physics : PCCP
|April 13, 2017
Summary
This study demonstrates unipolar resistive switching in Pt/MgO/Ta/Ru structures for nonvolatile memory. A thin tantalum oxide layer is crucial for oxygen vacancy motion and conductive filament formation, improving switching performance.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- Metal-insulator-metal (MIM) nanostructures are key for nonvolatile memory devices.
- Resistive switching (RS) in MIM devices offers high density and low power consumption.
Purpose of the Study:
- To investigate unipolar resistive switching in Pt/MgO/Ta/Ru nanostructures.
- To elucidate the role of a tantalum oxide layer in the resistive switching mechanism.
Main Methods:
- Fabrication of Pt/MgO/Ta/Ru structures with a 30 nm MgO barrier.
- Electrical characterization of resistive switching behavior, including forming process and voltage polarity effects.
- Analysis of ON/OFF resistance variability and stability.
Main Results:
- Unipolar resistive switching was achieved after a forming process.
- A thin TaOx layer significantly influences switching by acting as an oxygen reservoir.
- Conductive filament formation/rupture, driven by oxygen vacancy motion and Joule heating, explains the switching mechanism.
- Achieved OFF/ON resistance ratio of at least 2 orders of magnitude with stable states up to 104 s.
Conclusions:
- The TaOx layer is critical for enabling and controlling resistive switching in Pt/MgO/Ta/Ru devices.
- Understanding oxygen vacancy dynamics and filamentary models is essential for optimizing RS performance.
- The findings provide insights for improving resistive switching in similar material systems.