Thickness effects on the ME coefficient αME and electromechanical resonance frequency of Metglas/PZT/Metglas tri-layered laminates are investigated. The thickness of the magnetic plate is changed by assembling differ...Thickness effects on the ME coefficient αME and electromechanical resonance frequency of Metglas/PZT/Metglas tri-layered laminates are investigated. The thickness of the magnetic plate is changed by assembling different numbers of the Metglas thin sheets （30μm for each layer） while the PZT plate is maintained at constant thickness （0.5 mm）. At 1 kHz of the applied alter- nating magnetic field, only one peak presents in the ME coefficient （OCME） versus static magnetic field （Hs） curve. As the thickness ratio n increases, the peak value of αME first increases and reaches a maximum at approximately n = 0.519, and then decreases afterward. The peak position （Hoptim） moves steadily toward a higher value as n increases. It is suggested that the re- laxation factor k of the magnetic phase is reduced as n increases, causing the decrease of the piezomagnetic coefficient d11,m and the increase of Hoptim. By employing the micromechanics model and considering the degradation of dll,m with n, an opti- mized thickness ratio of 0.5 is predicted, which is in agreement with the experimental observations. The resonance frequency of the laminate increases with n, which is consistent with the calculation using a straightforward mixture law.展开更多
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...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。展开更多
基金supports by the Key Research Program of National Natural Science Foundation of China(Grant No. 10832009)
文摘Thickness effects on the ME coefficient αME and electromechanical resonance frequency of Metglas/PZT/Metglas tri-layered laminates are investigated. The thickness of the magnetic plate is changed by assembling different numbers of the Metglas thin sheets （30μm for each layer） while the PZT plate is maintained at constant thickness （0.5 mm）. At 1 kHz of the applied alter- nating magnetic field, only one peak presents in the ME coefficient （OCME） versus static magnetic field （Hs） curve. As the thickness ratio n increases, the peak value of αME first increases and reaches a maximum at approximately n = 0.519, and then decreases afterward. The peak position （Hoptim） moves steadily toward a higher value as n increases. It is suggested that the re- laxation factor k of the magnetic phase is reduced as n increases, causing the decrease of the piezomagnetic coefficient d11,m and the increase of Hoptim. By employing the micromechanics model and considering the degradation of dll,m with n, an opti- mized thickness ratio of 0.5 is predicted, which is in agreement with the experimental observations. The resonance frequency of the laminate increases with n, which is consistent with the calculation using a straightforward mixture law.
文摘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。
