Investigation on magnetoelectric and dielectric properties of Co0.9Mn0.3Fe1.8O4-Sr0.5Ba0.5Nb2O6 composites

The present paper reports the dielectric and magnetoelectric properties of Mn substituted yCo(1.2-x)Mn(x)Fe(1.8)O(4) (CMFO) and (1 - y) Sr0.5Ba0.5Nb2O6 (SBN) ME composites. The composites are formed with three weight percent of Bi2O3 as sintering aid. The Co1.2-xMnxFe1.8O4 is initially studied for variation of electrical resistivity rho, saturation magnetization Ms, permeability mu, coercive field Hc and coefficient of magnetostriction lambda to determine a composition suitable to form a ME composite. Here x = 0.3 is observed to posses optimal value of rho, Ms, mu, Hc and lambda, therefore the composites are formed using Co0.9Mn0.3Fe1.8O4. The composites y MSBN = y CMFO + (1 - y) SBN are synthesized and investigated for their structural, dielectric and magnetoelectric properties. The dielectric constant of composites is observed to exhibit contribution due to interfacial polarization as well as a contribution due to the SBN phase. The variation of linear magnetoelectric coefficient alpha and quadratic magneto electric coefficient beta for varies compositions are reported in this paper. The paper also repots the effect of sintering temperature and variation of frequency on the magnitude of alpha and beta. It is observed that the use of sintering aid increases the magnetoelectric output of the MSBN composites. The samples with y = 0.4 is observed to show sufficiently large and useful magnitude of magnetoelectric coefficients.