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Published on: June 7, 2018
Multiferroic BiFeO3 nanoparticles studied by electron spin resonance, X-ray diffraction and transmission electron
I Szafraniak-Wiza1, W Bednarski, S Waplak
1Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17/19, 60-179 Poznań, Poland.
Journal of Nanoscience and Nanotechnology
|May 21, 2009
Summary
Electron spin resonance spectroscopy revealed distinct magnetic ordering in bismuth ferrite (BiFeO3) nanoparticles. Annealing transformed ferro- and ferrimagnetic ordering to antiferromagnetic, highlighting ESR
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Multiferroic bismuth ferrite (BiFeO3) nanoparticles exhibit unique core-shell structures.
- Understanding magnetic ordering in these nanoparticles is crucial for advanced applications.
Purpose of the Study:
- To investigate the magnetic properties of BiFeO3 nanoparticles synthesized via mechanically activated room temperature synthesis.
- To explore the differences in ordered and disordered regions between as-prepared and annealed samples.
- To evaluate the utility of electron spin resonance spectroscopy in determining magnetic ordering.
Main Methods:
- Electron spin resonance (ESR) spectroscopy
- X-ray diffraction (XRD)
- Transmission electron microscopy (TEM)
Main Results:
- ESR and XRD data revealed significant differences in ordered and disordered regions.
- Thermal treatment led to grain growth and disappearance of disordered grain shells, confirmed by TEM.
- As-prepared nanoparticles showed ferro- and ferrimagnetic ordering, while annealed samples exhibited antiferromagnetic order.
Conclusions:
- Electron spin resonance spectroscopy is an effective method for characterizing magnetic ordering in multiferroic nanoparticles.
- The synthesis and annealing process significantly influences the magnetic properties and structure of BiFeO3 nanoparticles.
