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Synthesis and characterization of CoFe2O4–Ba0.9Sr0.1TiO3 magnetoelectric composites with dielectric and magnetic properties

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Abstract

Magnetoelectric composites of CoFe2O4 ferrite (CFO) and 10 mole % strontium doped BaTiO3 (BSTO) were synthesized by the solid state reaction method. The presence of two phases in the composite (x)CoFe2O4+(1−x)Ba0.9Sr0.1TiO3 (x=0.15, 0.30 and 0.45) was confirmed by XRD and FESEM. The relative dielectric constant with variation of frequency and temperature was studied. The magnetic hysteresis behavior was studied to find the response of CoFe2O4 ferrite to the applied magnetic field. The saturation magnetization decreases with increase of the phase fraction of BSTO in the composites, because the interaction between magnetic grains is weakened by the existence of nonmagnetic BSTO phase distributed in the magnetic phases. All composites after post calcination in oxygen were electrically and magnetically poled to exhibit a significant magnetoelectric effect. A maximum magnetoelectric voltage coefficient of about 0.826 mV/cm Oe was observed for the x=0.15 composite at room temperature.

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Authors and Affiliations

  1. Department of Physics, Pukyong National University, Busan, 608-737, South Korea

    C. M. Kanamadi, J. S. Kim, H. K. Yang, B. K. Moon, B. C. Choi & J. H. Jeong

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  1. C. M. Kanamadi
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  2. J. S. Kim
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Kanamadi, C.M., Kim, J.S., Yang, H.K. et al. Synthesis and characterization of CoFe2O4–Ba0.9Sr0.1TiO3 magnetoelectric composites with dielectric and magnetic properties. Appl. Phys. A 97, 575–580 (2009). https://doi.org/10.1007/s00339-009-5254-7

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