Ferromagnetic, ferroelectric, and fatigue behavior of (111)-oriented BiFeO3/(Bi1/2Na1/2)TiO3 lead-free bilayered thin films
Ferromagnetic, ferroelectric, and fatigue behavior of (111)-oriented BiFeO3/(Bi1/2Na1/2)TiO3 lead-free bilayered thin films
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DOI：
10.1063/1.3127519
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发表时间：
2009-04
影响因子：
4
通讯作者：
Jiagang Wu;Guangqing Kang;Huajun Liu;John Wang
中科院分区：
文献类型：
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作者：
Jiagang Wu;Guangqing Kang;Huajun Liu;John Wang
采用射频溅射法在Pt/TiO 2/SiO2/Si衬底上制备了由BiFeO 3（BFO）和（Bi 1/2Na 1/2）TiO 3（BNT）纳米层组成的无铅双层薄膜。与单层BNT和BFO薄膜相比，BFO/BNT双层薄膜具有较强的（111）取向，铁电性能和磁性能（2 Pr =52.2 μC/cm ~ 2，2 Ec =554.0 kV/cm，2 Ms =96.0 emu/cm ~ 3，2 Hc =253.2 Oe）明显提高，并且具有几乎无疲劳的极化行为。虽然空间电荷发生在组成纳米层之间的界面处，如由电容的频率色散所证实的，底部BNT纳米层似乎促进BFO层的生长和结晶，这在很大程度上是所观察到的铁电和磁性行为的原因。
Lead-free bilayered thin films consisting of BiFeO3 (BFO) and (Bi1/2Na1/2)TiO3 (BNT) nanolayers were deposited on the Pt/TiO2/SiO2/Si substrate by radio frequency sputtering. The bilayered BFO/BNT film exhibits a strong (111) orientation and much enhanced ferroelectric and magnetic properties (2Pr=52.2 μC/cm2, 2Ec=554.0 kV/cm, 2Ms=96.0 emu/cm3, and 2Hc=253.2 Oe) as compared to those of the single layer BNT and BFO thin films, together with an almost fatigue-free polarization behavior. Although space charges occur at the interface between the constituent nanolayers, as confirmed by the frequency dispersion of capacitance, the bottom BNT nanolayer appears to promote the growth and crystallization of BFO layer, largely responsible for the observed ferroelectric and magnetic behavior.