Control of Multiferroic properties in BiFeO3 nanoparticles

Scientific Reports
Diego Carranza-CelisJuan Gabriel Ramírez

Abstract

BiFeO3 (BFO) nanoparticles (NPs) were synthesized using the sol-gel method at different calcination temperatures from 400 °C to 600 °C. XRD studies have confirmed that all BFO NPs show distorted rhombohedral crystals that match the R3c space group. We found evidence of local structural strain that develops with increasing particle size as suggested by TEM and Raman spectroscopy measurements. Magnetic measurements suggest that NPs have two distinct regimes: a ferromagnetic-like one at low temperatures and a superparamagnetic-like one at room temperature. The crossover temperature increases with NPs size, suggesting a size-dependent blocking magnetic regime. Similarly, local piezoelectric measurements at room temperature in single NP have confirmed a ferroelectric order with a NP size-dependent d33 coefficient. An analysis of both the ferroelectric and the magnetic results suggest that ferromagnetism and ferroelectricity coexist at room temperature in NPs. Our results lead to the possibility of tailoring the ferroic order in multifunctional materials by means of NP size.

References

Jul 21, 2007·Acta Crystallographica. Section B, Structural Science·A PalewiczA W Hewat
Jun 25, 2008·Journal of Nanoscience and Nanotechnology·Babu R Guduri, Adriaan S Luyt
Sep 12, 2007·Journal of Physics. Condensed Matter : an Institute of Physics Journal·H FukumuraM Miyayama
Oct 10, 2014·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Je-Geun ParkSanghyun Lee
Oct 27, 2015·Journal of Applied Crystallography·Nicola Doebelin, Reinhard Kleeberg
Feb 6, 2018·Scientific Reports·Fengzhen HuangJinsong Zhu

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Methods Mentioned

BETA
X-Ray
transmission electron microscopy
scanning electron microscopy
AFM
piezoelectric force microscopy

Software Mentioned

Gatan Micrograph
Tescan LYRA
Profex

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