Magnitoelectrical properties of NdxBi1-xFeO3 multiferroics

On (Bi0.9Nd0.1)FeO3 films deposited on a glass substrate with ~ 160 nm thickness in a 100 Hz 0.9Nd0.1)FeO3 film has the same value as for bulk samples. The presence of the neodymium in the (Bi0.9Nd0.1)FeO3 films increases magnetocapacitance value at room temperature in comparison with BiFeO3. In the conditions of magnetic field absence a film permittivity has an anomaly at T = 394 K and magnetocapacitance (ε(Н) - ε(0))/ ε(0) reduces in several times. Using the results of the temperature dependences of the specific magnetization study are determined the values of the (Bi0.9Nd0.1)FeO3 films magnetic moment in a wide temperatures range. It was found that in the temperature range of ~ 80-1000 K the magnitude of the magnetic moment of the (Bi0.9Nd0.1)FeO3 films decreases from the value of μ = 1.11 μВ to μ = 0.24 μВ. In the 370-400 K temperature range, where we have a magnetocapacitance minimum and a sharp decreasing of the dielectric loss in the magnetic field, the magnetic moment of studied films has a value μ ≈ 0.9 μВ = const. The reduction of the magnetic moment value of the (Bi0.9Nd0.1)FeO3 film up to μ ≈ 0.35 μВ and output to the plateau at T ~600 K is most likely due by the magnetic phase transition peculiar to BiFeO3 near this temperature.