Figure 6
(a) Raman spectra of BFO nanoparticles with various sizes, in which the black lines and color lines correspond to the measured and fitted results, respectively. Temperature dependent dielectric constant under zero and 9.5 kOe magnetic field for the (b) 62 nm, (c) 31 nm and 18 nm particles. The inset in (b) gives the temperature dependent dielectric constant of the 62 nm BFO particles measured at different frequencies. (d) Temperature dependent MD effect for the BFO nanoparticles with various sizes.
