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One-dimensional multiferroic bismuth ferrite fibers obtained by electrospinning techniques.

Avinash Baji¹, Yiu-Wing Mai, Qian Li

¹Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia. avinash.baji@sydney.edu.au

|April 13, 2011

Summary

Novel multiferroic bismuth ferrite (BiFeO3) fibers were fabricated using electrospinning. These nanostructured fibers exhibit promising ferromagnetic and ferroelectric properties for advanced electroactive applications and nanoscale devices.

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Multiferroic materials exhibiting simultaneous magnetic and ferroelectric properties are highly sought after for advanced applications.
Bismuth ferrite (BiFeO3) is a prominent multiferroic material, but its fabrication into specific nanostructures like fibers presents challenges.

Purpose of the Study:

To report the successful fabrication of novel multiferroic nanostructured bismuth ferrite (BiFeO3) fibers.
To characterize the structural, magnetic, and ferroelectric properties of the synthesized BiFeO3 fibers.

Main Methods:

Sol-gel based electrospinning technique was employed to create BiFeO3/polyvinylpyrrolidone composite fibers.
Thermal annealing at 600°C in air was used to obtain phase-pure BiFeO3 fibers.
X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and piezoresponse force microscopy (PFM) were utilized for characterization.

Main Results:

Phase pure BiFeO3 fibers with rhombohedral perovskite structures were successfully synthesized.
SEM and TEM revealed dense, continuous fibrous structures composed of self-assembled fine grains.
The nanostructured fibers demonstrated ferromagnetic behavior with coercivity of ~250 Oe and saturation magnetization of ~1.34 emu g⁻¹.
PFM confirmed ferroelectricity and observed polar domain switching behavior.

Conclusions:

The study successfully fabricated multiferroic BiFeO3 nanostructured fibers via electrospinning.
The synthesized fibers possess desirable structural, magnetic, and ferroelectric properties.
These findings highlight the potential of these multiferroic fibers for electroactive applications and nano-scale devices.