Chen Zhaojiang, Zhang Yang, Li Shiyang, Lu Xuan-Ming, Cao Wenwu
Siemens Medical Solutions USA, Inc., Issaquah, Washington 98029, USA.
College of Mathematics, Physics and Information Engineering, Zhejiang Normal University, Jinhua, Zhejiang 321004, China.
Appl Phys Lett. 2017 May 15;110(20):202904. doi: 10.1063/1.4983712. Epub 2017 May 17.
The frequency dependence of the coercive field in [001] poled 0.71Pb(MgNb)O-0.29PbTiO single crystals was investigated as a function of frequency from 0.01 Hz to 5 MHz. was found to be proportional to [Formula: see text] as predicted by the Ishibashi and Orihara model, but our results showed two frequency regimes separated at around 1.0 MHz with different values. This change of switching kinetics may be due to the presence of slower relaxation times for non-180° domain switching and heterogeneous nucleation of polar nanoregions, whose contribution to polarization reversal is frozen out beyond 1.0 MHz, leading to a larger .
研究了[001]极化的0.71Pb(MgNb)O - 0.29PbTiO单晶中矫顽场的频率依赖性，其频率范围为0.01 Hz至5 MHz。结果发现，正如石桥和折原模型所预测的那样，矫顽场与[公式：见正文]成正比，但我们的结果显示，在约1.0 MHz处存在两个频率区域，其矫顽场值不同。这种开关动力学的变化可能是由于非180°畴开关存在较慢的弛豫时间以及极性纳米区域的异质成核，在超过1.0 MHz时，它们对极化反转的贡献被冻结，导致更大的矫顽场。
