Enhanced magnetoelectric properties of the composite films of Bi0.5Na0.5Ti0.98Fe0.02O3-δ-NiFe1.98Nd0.02O4 with different deposition sequences

The films of Bi 0.5 Na 0.5 Ti 1-x Fe x O 3-δ and NiFe 2-x Nd x O 4 were deposited via spin-coating method. The results indicate that the film of Bi 0.5 Na 0.5 Ti 0.98 Fe 0.02 O 3-δ possesses good ferroelectric performance with remnant polarization as high as 25.2 µC·cm −2 and the film of NiFe 1.98 Nd 0.02 O 4 possesses a maximal saturation magnetization (282.4 emu·cm −3 ). The composite films of Bi 0.5 Na 0.5 Ti 0.98 Fe 0.02 O 3-δ -NiFe 1.98 Nd 0.02 O 4 with different deposition sequences were also prepared. In contrast to single-phase films, magnetoelectric composite films exhibit smaller remnant polarization and saturation magnetization. The film of NiFe 1.98 Nd 0.02 O 4 /Bi 0.5 Na 0.5 Ti 0.98 Fe 0.02 O 3-δ (NB) possesses greater values of remnant polarization, saturation magnetization and magnetoelectric coupling coefficient than those for the composite film of Bi 0.5 Na 0.5 Ti 0.98 Fe 0.02 O 3-δ /NiFe 1.98 Nd 0.02 O 4 (BN). The composite film of BN exhibits greater magnetoelectric coupling coefficients as high as 169.7 mV·cm −1 ·Oe −1 .