Anomaly in structural noncentrosymmetry around T-N in bulk and nanoscale BiFeO3

作者：Goswami Sudipta^*; Bhattacharya Dipten; Iles Gail N; Ghosh Barnali; Prytuliak Anastasiia A; Malard Benoit; Das Gopes C; Ouladdiaf B; Chatterji T

来源：Powder Diffraction, 2013, 28(S2): S94-S105.

DOI：10.1017/S0885715613001115

• multiferroics
• structural noncentrosymmetry
• powder neutron diffraction
• nanoscale BiFeO3

Using high resolution powder neutron diffraction data, we show that there is a distinct anomaly in the structural noncentrosymmetry around the magnetic transition point T-N for bulk and nanoscale BiFeO3. It appears that the structural noncentrosymmetry - which gives rise to the ferroelectric polarization - is suppressed anomalously by similar to 1% (of the average noncentrosymmetry at above the magnetic transition) in the bulk sample and by similar to 12% in the nanoscale sample as the magnetic transition is approached from higher temperature. This observation shows that the multiferroic coupling improves in the nanoscale sample which is expected to brighten the application prospects of nanoscale BiFeO3 in nanospintronics-based sensor devices.

• 出版日期2013-9