investigations on magnetoelectric and magnetodielectric properties of cmfo–pbt composites

 

the present paper reports the dielectric, magnetodielectric, and magnetoelectric properties of mn-substituted co_1.2−x mn x fe_1.8o₄ (cmfo) and pb_0.2ba_0.8tio₃ (pbt) magnetoelectric (me) composites. the co_1.2−x mn _x fe_1.8o₄ is initially studied for variation of electrical resistivity ρ, saturation magnetization m s, permeability μ, coercive field h c, and coefficient of magnetostriction λto determine compositions suitable to form the me composite. here, x = 0.4 and 0.1 are observed to possess optimum values of ρ, m s, μ, h c, and λ; therefore, the composites are formed using co_0.8mn_0.4fe1.8o₄ (cmfo _0.4) as well as co_1.1mn_0.1fe_1.8o₄ (cmfo 0.1). the composites were synthesized and investigated for their structural, dielectric, magnetoelectric, and magnetodielectric properties. the dielectric constant of the composites is observed to exhibit a contribution due to interfacial polarization as well as a contribution due to the pbt phase. the variation of the linear magnetoelectric coefficient, α, quadratic magnetoelectric coefficient, β, and magnetocapacitance, mc, for various compositions are reported in this paper. the paper also reports the effect of sintering temperature and variation of frequency on the magnitude of α and m _c. the samples with y = 0.5 are observed to show a sufficiently large and useful magnitude of magnetoelectric coefficients and m _cvalue.