Variation of dielectric permeability by applying magnetic field in nano-composite Bi2O3–Fe2O3–PbTiO3 sputtered films

Abstract The variation of complex dielectric permeability e r = e ′ r − je ″ r with magnetic field H was studied in nano-composite ferromagnetic oxide films of the Bi 2 O 3 –Fe 2 O 3 –PbTiO 3 system prepared by RF-reactive sputtering. The magnetic field dependent part of e ′ r , i.e. Δ e′ r ( H ) , shows a hysteresis loop and its maximum change |Δ e′ r ( H )| max exactly occurs at its coercive field H C , indicating that this phenomenon is closely correlated with magnetization process.