Multiferroic properties of bilayered BiFeO3/CoFe2O4 nano-hollowspheres

• Published in: Materials letters Vol. 210; pp. 80 - 83
• Main Authors: Alam, Mahebub, Talukdar, Souvanik, Mandal, Kalyan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2018
• Subjects: Electrical properties; Magnetic materials; Nanoparticles; Nanoparticles; Electrical properties; Magnetic materials
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2017.08.097

•Electric and magnetic properties indicate multiferroic behaviour of CFO/BFO NHSs.•The coexistence of the FE BiFeO3 and FM CoFe2O4 gives rise to a significant ME effect.•Maximum ME coefficient estimated to be ∼αME=8.6mV/cmOe at a frequency of 1kHz.•ME coupling develop through stress-mediated magnetic–mechanical–electric transformation.
Here, we reported the synthesis of bilayered BiFeO3/CoFe2O4 nano-hollow spheres (NHSs) by depositing a BiFeO3 (BFO) layer of thickness ∼20nm on CoFe2O4 (CFO) nano-hollow spheres surface of diameter ∼250nm and investigated their electric, magnetic and magnetoelectric properties in view of their applications in electronic and magnetic devices. The nano-composites exhibit better properties compared to their individual counterpart. The maximum polarization in CFO/BFO NHSs is found to be 2.1µC/cm2 at a frequency 50Hz. Magnetic measurements show the saturation magnetization to be 30.1emu/g with high value of remnant magnetization (17.9emu/g), and coercivity (1320Oe). Its magnetoelectric coefficient, αME at 1kHz is estimated to be ∼8.6mV/cmOe.