Dielectric and Magnetic properties of Pb(Fe_(0.5)Nb_(0.5))O_3 - Ni_(0.65)Zn_(0.35)Fe_2O_4 Composites

摘要

We report Raman spectra, magnetic, ferroelectric, and dielectric properties of (1-x)Pb(Fe_(0.5)Nb_(0.5))O_3 -xNi_(0.65)Zn_(0.35)Fe_2O_4 (x = 0.1-0.4) (PFN-NZFO) composites. Raman spectra reveal that the magnetic coupling strength increases with increasing NZFO concentration, which is well supported by the magnetization data. However, the saturation polarization and the maximum dielectric constant decrease with increasing NZFO concentration. The tan S is found to be very small (< 0.2) for x = 0.2 and it increases with increasing x. Our results suggest that, the x = 0.2 composite shows significantly large saturation magnetization and polarization, large dielectric constant, and very low dielectric loss at room temperature, which makes it an excellent multiferroic material at room temperature and hence it is a promising candidate for practical applications.