NDLI: Effects of size and oxygen annealing on the multiferroic behavior of bismuth ferrite nanoparticles

Content Provider	Springer Nature Link
Author	Manzoor, Alina Hasanain, S. K. Mumtaz, A. Berti, M. F. Franzel, L.
Copyright Year	2012
Abstract	We have compared the multiferroic behavior in different-sized BiFeO$_{3}$ nanoparticles (11–29 nm) prepared by a solution evaporation method. The effects of oxygen vacancies on the behavior of phase pure BiFeO$_{3}$ have been studied for particles prepared under two different annealing environments, air and oxygen. We find that BiFeO$_{3}$ nanoparticles show weak ferromagnetism at room temperature which increases with decreasing particle size. However, the effects are determined not to be related to the presence of more oxygen vacancies, since oxygen annealing increases the magnetic moment in this system. In dielectric studies, we observe clear evidence for magnetoelectric coupling with the imaginary part of dielectric constant exhibiting a clear anomaly around the magnetic transition temperature (T ~ 560 K). In high temperature resistivity measurements insulating and activated resistivity behavior is observed with the activation energies being lower for T < T $_{N}$. The increased ferromagnetism in smaller particles is explained in terms of suppression of the antiferromagnetic spin spiral whereas oxygen annealing actually leads in our case to an improvement of the crystallinity.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	14
Issue Number	12
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-11-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	BiFeO$_{3}$ Dielectric constant Ferroelectricity Ferromagnetism Nanoparticles Resistivity X-ray diffraction Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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