Fabrication, magnetic, and ferroelectric properties of multiferroic BiFeO3 hollow nanoparticles

Authors

Yi Du, University of WollongongFollow
Zhenxiang Cheng, University of WollongongFollow
S X. Dou, University of WollongongFollow
Darren J. Attard, University of WollongongFollow
Xiaolin Wang, University of WollongongFollow

RIS ID

37730

Publication Details

Du, Y., Cheng, Z., Dou, S. Xue., Attard, D. J. & Wang, X. (2011). Fabrication, magnetic, and ferroelectric properties of multiferroic BiFeO3 hollow nanoparticles. Journal of Applied Physics, 109 (7), 073903-1-073903-5.

Abstract

Hollow BiFeO₃ nanoparticles were synthesized by an electrospray route for the first time. The phase purity and structure have been investigated by x-ray diffraction and Raman spectroscopy. Transmission and scanning electron microscope investigations revealed that the as-obtained BiFeO₃ hollow spheres were polycrystalline, with a shell thickness of 35 nm. The formation mechanism can be possibly explained by Ostwald ripening. Raman spectra have verified decreased vibrational frequencies in BiFeO₃ nanoparticles. These hollow and core-shell multiferroic nanoparticles exhibit significantly enhanced ferromagnetism from 5 to 600 K due to a broken spiral spin structure. The ferroelectricity of hollow BiFeO₃ particles exhibits a lower switching electric field, which is confirmed by Kelvin probe force microscopy.