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This work describes the observations made on particle size dependence of magnetoelectric multiferroic coupling in nanoscale multiferroic BiFeO3 system. By using x-ray and neutron diffraction experiments, the ferroelectric and multiferroic properties have been investigated. It is found that they follow a non-monotonic pattern of variation with particle size in the 20-200 nm range. This non-monotonicity appears to be resulting from competition between lattice microstrain and compressive pressure effect observed in these nanosized particles. The implication of this result could be profound for designing nano-spintronic devices using nanoscale BiFeO3.

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Dr. Sudipta Goswami, a researcher working in the area of condensed matter physics, has made significant contribution in the area of ferroelectric, magnetic, and multiferroic properties of nanoscale transition metal oxide systems. She has numerous publications in prestigious international journals including Phys. Rev. Lett. Her work is well cited.

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