Electrophoretic deposition of multiferroic BaTiO₃/CoFe₂O₄ bilayer films

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• 作者：Dongxiang Zhou^a ; Gang Jian ; ^a ; ^{jiangang456@126.com} ; Yunxiang Hu^a ; Yanan Zheng^a ; Shuping Gong^a ; Huan Liu^a
• 关键词：Multilayers ; Ferroelectricity ; Magnetic properties
• 刊名：Materials Chemistry and Physics
• 出版年：2011
• 出版时间：16 May 2011
• 年：2011
• 卷：127
• 期：1-2
• 页码：316-321
• 全文大小：1041 K

文摘

Electrophoretic deposition (EPD) method was used to fabricate multiferroic BaTiO₃/CoFe₂O₄ (BTO/CFO) bilayer film with a thickness up to 15 μm. Sediment volumes and zeta potential studies showed suspensions of BTO in ethanol–acetylacetone (1:1 in volume) and CFO in acetylacetone with 0.20 wt % PEI added were the most stable dispersion systems, respectively. Thoroughly dispersed suspensions of BTO and CFO were formed under ultrasonic agitation for 30 and 50 min. Effects of particle size distribution on deposition process were also investigated. XRD, SEM analysis showed the annealed bilayer film had two well-defined BTO/CFO phases and dense microstructure. The obtained bilayer films exhibited evident ferroelectricity (P_s = 14.1 μC cm⁻²) and ferromagnetism (M_s = 148.7 emu cm⁻³ (in plane)) simultaneously at room temperature.