Synthesis and characterization of composite MgFe{sub 2}O{sub 4}-BaTiO{sub 3} multiferroic system
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A-STAR), 3 Research Link, Singapore 117602 (Singapore)
- Department of Mechanical Engineering, National University of Singapore, Singapore 117576 (Singapore)
Multiferroic ceramics with the general formula (x)MgFe{sub 2}O{sub 4}-(1-x)BaTiO{sub 3} (x=0.4, 0.5, and 0.6) were synthesized by solid-state sintering process. From the x-ray diffraction analysis, it was observed that almost no chemical reaction occurs between the ferrite and the ferroelectric materials used to form the diphase composite systems. No impure phase was observed in all the sintered composite systems. Leakage current density, ferroelectric properties and dielectric properties were found to improve with the addition of the ferroelectric phase. For the composite with the least amount of ferrite, the values of remnant polarization (2P{sub r}) before and after dc magnetic poling at 7 kOe for 1 h were found to be 1.35 and 2.12 {mu}C/cm{sup 2}, respectively. This showed marked improvement as high as 57% and confirmed the coupling of the electrical dipoles with the magnetic field applied. All the studied composite systems proved to be multiferroic in nature. The highest magnetoelectric coupling coefficient of 50.2 mV/cm Oe was measured at dc magnetic field of 10 kOe along with ac frequency of 50 Hz at room temperature for the 0.6MgFe{sub 2}O{sub 4}-0.4BaTiO{sub 3} composite system. Magnetoelectric effect at resonance frequency increases by a factor of 80 compared to the other frequencies for such composite systems.
- OSTI ID:
- 21137249
- Journal Information:
- Journal of Applied Physics, Vol. 103, Issue 9; Other Information: DOI: 10.1063/1.2917394; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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