Patterned nano-domains in PMN-PT single crystals
Patterned nano-domains in PMN-PT single crystals
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DOI：
10.1016/j.actamat.2017.10.016
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发表时间：
2018-01
期刊：
影响因子：
9.4
通讯作者：
Wei-Yi Chang;C. Chung;Zhongyuan Yuan;Chih‐Hao Chang;J. Tian;D. Viehland;Jiefang Li;Jacob L. Jones-Jacob-L.
中科院分区：
文献类型：
--
作者：
Wei-Yi Chang;C. Chung;Zhongyuan Yuan;Chih‐Hao Chang;J. Tian;D. Viehland;Jiefang Li;Jacob L. Jones-Jacob-L.
本文研究了含纳米级MnO_2半导体和Ti/Au导电层的0.7CuPbTiO_3(Mg1/3Nb2/3)O_3-0.3PbTiO_3(PMN-PT)纳米复合电极的电畴结构、介电性能和压电性能。这些人工的氧化锰纳米级可以改变电场分布，从而提高磁畴密度。用Ti/Au-MnOx型纳米复合电极制备的PMN-PT晶体在1 kHz频率下的压电常数为2250 pm/V，介电常数为5400℃。与传统平面电极相比，纳米复合电极的压电常数和介电常数分别提高了36.7%和38.3%。压电响应力显微镜(PFM)图像显示了电极/单晶界面附近的电畴图案。在厚度小于2 0 0μm的样品中发现了由MnO纳米复合电极诱导的线性电畴结构，飞行时间二次离子质谱仪(TOF-SIMS)结果表明，在MnO O纳米复合电极热处理过程中，Mn在PMNPT晶体中的扩散深度约为30 0 nm。人们认为，纳米复合电极的条纹效应引起的局域高电场可以促进新磁畴的形核，并且从图案化的锰层扩散也可以导致磁畴壁迁移率的提高。我们的发现为定制PMN-PT单晶的介电和压电性能开辟了一种新的领域工程技术。
The domain structure, dielectric, and piezoelectric properties of 0.7 Pb(Mg1/3Nb2/3)O3-0.3PbTiO3(PMN-PT) single crystals with nanocomposite electrode, which includes MnOxsemiconductor nanogratings and a Ti/Au conductive layer, were studied in this paper. These artificial MnOxnanogratings can alter the electric field distribution and then enhance the domain density. PMN-PT crystals with Ti/Au-MnOxnanocomposite electrodes showed high piezoelectric constant of 2250 p.m./V and dielectric constant of 5400 at 1 kHz, respectively. Compared to ones with conventional planar electrodes, the piezoelectric and dielectric constants of the samples with nanocomposite electrodes were increased 36.7% and 38.3%, respectively. Piezoresponse force microscopy (PFM) images revealed the domain pattern near the electrode/single crystal interface. A linear domain structure induced by the MnOxnanocomposite electrode was found in the samples with thickness less than 200 μm. Time-of-flight secondary ion mass spectrometry (TOF-SIMS) results showed the diffusion of Mn about 300 nm in depth in PMNPT crystal after heat treatment during MnOxnanocomposite electrode. It is believed that the localized high electric fields induced by fringe effects caused by the nanocomposite electrode can enhance nucleation of new domains, and that diffusion from the patterned Mn layer may also lead to an enhancement in domain wall mobility. Our findings open up a new domain engineering technique for tailoring the dielectric and piezoelectric properties of PMN-PT single crystals.