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Multiferroics is a class of functional materials that simultaneously exhibitferroelectricity and ferromagnetism in a single structure. We report here theintegration of anti-ferroelectricity and ferromagnetism in a new M-typehexaferrite compound, in which 0.3 Sr ions was substituted by 0.2 La3+ ions inSrFe12O19 so as to keep the charge balance. This doped compound is expressed asa molecular formula of La0.2Sr0.7Fe12O19, which was confirmed by XRD to havethe same structure as SrFe12O19 with a lattice contraction of 0.59%.Surprisingly, the doping effect turns La0.2Sr0.7Fe12O19 from ferroelectric toantiferroelectric phase, which displays double hysteresis loops with a maximumpolarization of 154 uC/cm2 and a remnant one of 38uC/cm2. The dielectricconstant is also greatly improved from 1462 to 1451778 at 10.2Hz by thissubstitution. This compound simultaneously demonstrates strong ferromagnetism,the remnant magnetic moment and coercive field are 52 emu/g and 5876 Oe,respectively. In addition, La0.2Sr0.7Fe12O19 also exhibits strongmagnetodielectric (MD) response, in which a applying magnetic field B lifts thewhole e1-f spectra up and right shifts e2-f spectra to higher frequency side.Both real and imaginary parts of the dielectric constant varies with frequencyand B field and obey Debye relaxation model. The maximum MD increment in e1reaches as high as 540830 upon a B field of 926mT. The capacitance of theLa0.2Sr0.7Fe12O19 ceramics could be much more enhanced by applying a magneticfield B, which could induce an additional polarization P(H) upon theconventional P(E) by the cycloid conical spin in the intermediate phases. Theseresults suggest that La0.2Sr0.7Fe12O19 exhibits a strong interplay betweenmagnetic ordering and ferroelectricity, which makes it a good magnetoelectriccoupling candidate.

Antiferroelectric and Magnetodielectric Coupling Response of La0.2Sr0.7Fe12O19 Ceramics