Excellent Bidirectional Adjustable Multistage Resistive Switching Memory in Bi₂FeCrO₆ Thin Film

Area of Science:

• Materials Science
• Electrical Engineering
• Solid State Physics

Background:

• Multistage resistive switching devices are crucial for enhancing resistive random-access memory (RRAM) storage density.
• Existing devices lack stability and controllability, and their working mechanisms remain poorly understood.
• Developing reliable multistage switching is essential for next-generation memory technologies.

Purpose of the Study:

• To prepare a stable and controllable multistage resistive switching device.
• To elucidate the underlying working mechanism of the observed switching behavior.
• To provide insights for the development of advanced resistive memory.

Main Methods:

• Fabrication of a sandwich-structured device via spin coating using Bi2FeCrO6 thin films.
• Characterization of the device's resistive switching properties, including on/off ratio and endurance.
• Analysis of the switching mechanism through investigation of ion migration and Schottky barrier modulation.

Main Results:

• Successfully prepared a device exhibiting bidirectional controllable multistage resistive switching.
• Achieved a maximum on/off ratio of 10^4 with excellent stability over 100 slow loops and 10^4 pulse cycles.
• Identified reversible changes in Schottky barrier height due to defect-induced ion migration as the key mechanism.

Conclusions:

• The Bi2FeCrO6 thin film device demonstrates a novel voltage-controlled, bidirectional multistage resistive switching behavior.
• The study provides the first report on this specific switching behavior in Bi2FeCrO6.
• This work offers significant insights into the preparation and mechanism of multistage resistive switching devices.