The superior multiferroic properties of Bi0.85Nd0.15Fe0.98Mn0.02O3/CoFe2O4 heterostructure thin film at room temperature

• BNFMO/CFO heterostructure was prepared by CSD method.
• The excellent ferroelectricity (Pr~117 μC/cm2) is obtained in the BNFMO/CFO.
• The magnetism of the heterostructure should be dominated by the CFO layer.
• BNFMO/CFO exhibits good ferromagnetic hysteresis (Mr~60 emu/cm3).

Bi0.85Nd0.15Fe0.98Mn0.02O3/CoFe2O4 (BNFMO/CFO) heterostructure was synthesized on FTO substrates by the chemical solution deposition method. X-ray diffraction (XRD) and Raman spectra confirm the existence of structure transformation or distortion in BNFMO layer. Scanning electron microscope (SEM) shows that the BNFMO and CFO phases have retained the perfect heterostructure. Furthermore, the BNFMO/CFO heterostructure exhibits both good ferroelectric and ferromagnetic properties at room temperature. The remanent polarization (Pr) and the coercive field (Ec) are ~117 μC/cm2 and ~410 kV/cm, while the remanent magnetization (Mr) and the coercive magnetic field (Hc) are ~60 emu/cm3 and ~1050 Oe. It is also found the significant role of the CFO layer for the ferromagnetic behavior can be observed in the BNFMO/CFO heterostructure.

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