Magnetodielectric effect in lead-free multiferroic CoFe2O4/K0.5Na0.5NbO3 bilayers

• DOI: 10.1016/j.matlet.2012.08.096
• Publication Date: 2012-08-30T03:01:51Z
• Authors: Shumin He; Guolei Liu; Jing Xu; Jianye Yang; Yanxue Chen; Shishou Kang; Shishen Yan; Liangmo Mei
• Keywords: Volume fraction

Abstract In this letter we presented the investigations of magnetodielectric (MD) effect in lead-free multiferroic CoFe 2 O 4 /Na 0.5 K 0.5 NbO 3 (CFO/KNN) bilayers with constant volumes. The CFO/KNN bilayers were synthesized on conductive Nb-doped SrTiO 3 (001) single-crystal substrates by radio frequency magnetron sputtering. Noticeable MD effect was observed in these CFO/KNN bilayers. The MD coefficient depends on the volume fraction of CFO layer. A maximum MD coefficient of about 7% at 12 kOe at 2 kHz was observed in 0.6CFO/0.4 KNN bilayer. The MD effect is attributed to strain-mediated magnetoelectric effect and magnetoresistance effect combined with the Maxwell–Wagner effect. The MD effect may have possible applications in magnetic field sensing devices.