Needle‐Like Ferroelastic Domains in Individual Ferroelectric Nanoparticles
Needle‐Like Ferroelastic Domains in Individual Ferroelectric Nanoparticles
复制标题
单个铁电纳米粒子中的针状铁弹性域
DOI：
10.1002/aelm.201901300
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发表时间：
2020
影响因子：
6.2
通讯作者：
E. Fohtung
中科院分区：
文献类型：
--
作者：
Zhen Liu;Elijah Schold;D. Karpov;R. Harder;T. Lookman;E. Fohtung
上级结构、物理和电子特性使得铁电纳米晶体在实现一系列下一代器件方面至关重要。铁电响应由晶体结构和畴形态决定。可逆地置换、产生和消除弹性域的能力对于器件应用是至关重要的。虽然电场控制已经被证明用于铁电180°表面畴壁和涡旋，但是对单个纳米晶体内的铁弹畴和畴边界的类似控制仍然具有挑战性。使用控制外部的压缩和拉伸轴向应力，确定性和可逆的控制高度移动的铁弹域和轴向极化在三维演示。虽然有许多研究存在于薄膜和散装的铁弹域，很少有人知道在单个纳米粒子水平的铁弹相互作用，特别是涉及域边界。通过结合布拉格相干X射线衍射成像和朗道理论，单个钛酸钡纳米晶体中的应变梯度被证明可以稳定针状铁弹孪晶畴。这些域是高度不稳定的轴向应力下，产生局部增强的电介导的铁电相变的极化。布拉格相干X射线衍射成像在三维操作域研究中的功效得到了证明，而与理论的协同作用为域边界工程和纳米级功能器件的潜力提供了范例。
Superior structural, physical, and electronic properties make ferroelectric nanocrystals essential in enabling a range of next‐generation devices. Ferroelectric responses are determined by crystal structure and domain morphology. The ability to reversibly displace, create, and annihilate elastic domains is critical to device applications. Although electric‐field control has been demonstrated for ferroelectric 180° surface domain walls and vortices, similar control of ferroelastic domains and domain boundaries within individual nanocrystals remains challenging. Using controlled external compressive and tensile axial stress, deterministic and reversible control of highly mobile ferroelastic domains and axial polarization in three dimensions is demonstrated. While many studies exist on ferroelastic domains in thin films and bulk, little is known about ferroelastic interactions at the single nanoparticle level, especially involving domain boundaries. Through combining Bragg coherent X‐ray diffractive imaging and Landau theory, strain gradients in individual BaTiO3 nanocrystals are shown to stabilize needle‐like ferroelastic twin domains. These domains are highly labile under applied axial stress, producing a locally enhanced electric polarization mediated by a ferroelectric phase transition. The efficacy of Bragg coherent X‐ray diffractive imaging in studying in operando domains in three dimensions is demonstrated, while synergy with theory provides a paradigm for domain boundary engineering and potential for nanoscale functional devices.
影响因子：
4.6
作者：
Butykai Á;Bordács S;Kézsmárki I;Tsurkan V;Loidl A;Döring J;Neuber E;Milde P;Kehr SC;Eng LM
通讯作者：
Eng LM
影响因子：
2.3
作者：
Schroeder, Mathias;Chen, Xi;Eng, Lukas M.
通讯作者：
Eng, Lukas M.
影响因子：
41.2
作者：
Seidel, J.;Martin, L. W.;Ramesh, R.
通讯作者：
Ramesh, R.