CoFe_2O_4/Ba_(0.9)Ca_(0.1)Ti_(0.9)Zr_(0.1)O_3双层复合薄膜的磁电性能研究

Study on the Magnetoelectric Properties of the CoFe_2O_4/Ba_(0.9)Ca_(0.1)Ti_(0.9)Zr_(0.1)O_3 Bilayer Composite Thin Film

通过脉冲激光沉积法(PLD)在(001)-SrRuO_3/SrTiO_3(SRO/STO)衬底上生长了CoFe_2O_4/Ba_(0.9)Ca_(0.1)Ti_(0.9)Zr_(0.1)O_3(CFO/BCZT)双层磁电复合薄膜。采用X射线衍射仪(XRD)、原子力显微镜(AFM)和扫描电子显微镜(SEM)测试样品的晶体结构及形貌。XRD结果显示:单相BCZT铁电薄膜、CFO铁磁薄膜及CFO/BCZT磁电复合薄膜均为(00l)择优取向结构。物理性能测试结果表明:CFO/BCZT复合薄膜具有良好的铁电性能(剩余极化值,Pr=15. 1μC/cm^2)、铁磁性能和磁电耦合性能(磁电耦合系数,αE～82. 4 m V·cm^(-1)·Oe^(-1))。这种无铅的磁电复合薄膜为设计新型多铁电子器件提供了一种选择。

CoFe 2O 4/Ba 0.9 Ca 0.1 Ti 0.9 Zr 0.1 O 3 (CFO/BCZT) bilayer magnetoelectric composite thin film grown on (001)-SrRuO 3/SrTiO 3 (SRO/STO) substrate was prepared by pulsed laser deposition. The crystal structure and morphology of the samples were investigated by X-ray diffraction(XRD), atomic force microscope(AFM) and scanning electron microscope(SEM). XRD results show that the single-phase BCZT ferroelectric, CFO ferromagnetic and CFO/BCZT magnetoelectric composite thin films are of (00 l ) preferred orientation. Physical properties testing indicate that the CFO/BCZT composite film exist excellent ferroelectric (the remnant polarizations, P r=15.1 μC/cm^2), ferromagnetic and magnetoelectric coupling properties(magnetoelectric coupling coefficient,α E-82.4 mV·cm ^-1 ·Oe ^-1 ).