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Related Experiment Video

Updated: Jun 8, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VO_x

Published on: May 13, 2020

Novel room temperature multiferroics for random access memory elements.

Ashok Kumar¹, Ram S Katiyar, James F Scott

¹Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|October 5, 2010

Summary

This summary is machine-generated.

We developed novel ferroelectric materials exhibiting both ferroelectricity and ferromagnetism above room temperature. Magnetic fields can switch polarization, enabling potential three-state logic devices.

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

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Published on: January 21, 2016

Area of Science:

Materials Science
Solid State Physics
Ferroelectric Materials

Background:

Ferroelectric materials are crucial for electronic devices, but achieving room-temperature multiferroicity remains a challenge.
Strain coupling via electrostriction and magnetostriction in ferroelectrics is key for advanced functionalities.
Existing multiferroic materials often exhibit weak effects or require cryogenic temperatures.

Purpose of the Study:

To fabricate single-phase tetragonal ferroelectrics with coexisting ferroelectricity and ferromagnetism.
To investigate the magnetic field-induced switching of ferroelectric polarization.
To explore the potential for room-temperature, magnetically switchable polarization in novel materials.

Main Methods:

Fabrication of PZT-PFW (PbZr₀.₅₂Ti₀.₄₈O₃)1-x(PbFe₂/₃W₁/₃O₃)x [PZTFWx] via chemical solution deposition (polycrystalline) and pulsed laser deposition (epitaxial).
Characterization of ferroelectric and magnetic properties above room temperature.
Application of magnetic fields (μ₀H < 1.0 T) to probe polarization switching behavior.

Main Results:

Successfully synthesized single-phase tetragonal PZTFWx (0.2 < x < 0.4) exhibiting ferroelectricity and weak ferromagnetism above room temperature.
Demonstrated magnetic field-induced destabilization of ferroelectric ordering and polarization switching from ~22 μC/cm² to zero (relaxor state).
Observed large-magnitude polarization switching at room temperature, distinct from previous findings in similar materials.

Conclusions:

The PZTFWx system offers a promising platform for room-temperature multiferroic applications.
Magnetically controlled polarization switching enables the possibility of three-state logic devices (+P, 0, -P).
The large switching magnitude and room-temperature operation suggest potential for commercial device realization.