Related Experiment Video
Updated: Mar 3, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
Multi-Nonvolatile State Resistive Switching Arising from Ferroelectricity and Oxygen Vacancy Migration
Weiming Lü1, Changjian Li2,3, Limei Zheng1
1Condensed Matter Science and Technology Institute, Department of Physics, Harbin Institute of Technology, Harbin, 150001, China.
This study shows that barium titanate ferroelectric tunnel junctions exhibit both oxygen vacancy migration and ferroelectric switching. This dual mechanism creates multi-state nonvolatile memory devices with enhanced performance.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Resistive switching phenomena are crucial for advanced memory technologies.
- Oxygen vacancy migration (OVM) and ferroelectric switching are two key mechanisms.
- Ferroelectric tunnel junctions (FTJs) utilize ferroelectric polarization for switching.
Purpose of the Study:
- To demonstrate the coexistence of OVM and ferroelectric switching in BaTiO3 FTJs.
- To compare BaTiO3 FTJs with SrTiO3 based devices.
- To explore the potential for multistate nonvolatile memory.
Main Methods:
- Fabrication and characterization of BaTiO3 and SrTiO3 based tunnel junctions.
- Electrical transport measurements to analyze resistive switching behavior.
- Comparative analysis of switching mechanisms in different materials.
Main Results:
- Demonstrated coexistence of OVM and ferroelectric switching in BaTiO3 FTJs.
- Observed two distinguishable resistive switching loops.
- Identified ferroelectric switching as the primary mechanism and OVM as a secondary mechanism.
Conclusions:
- Controlled oxygen vacancies in BaTiO3 enable combined OVM and ferroelectric tunneling.
- This combination leads to multistate nonvolatile memory devices.
- The findings offer a pathway for developing next-generation memory technologies.
Related Concept Videos
MOS Capacitor
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Non-ohmic Devices
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
Metal-Semiconductor Junctions
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Ferromagnetism
Dielectric Polarization in a Capacitor
Biasing of Metal-Semiconductor Junctions
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

