Tip-induced flexoelectricity, polar vortices, and magnetic moments in ferroelastic materials
Tip-induced flexoelectricity, polar vortices, and magnetic moments in ferroelastic materials
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DOI：
10.1063/5.0039509
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发表时间：
2021-02
影响因子：
3.2
通讯作者：
Guangming Lu;Suzhi Li;Xiangdong Ding;Jun Sun;E. Salje
中科院分区：
文献类型：
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作者：
Guangming Lu;Suzhi Li;Xiangdong Ding;Jun Sun;E. Salje
双铁弹性薄膜中的挠性电在双壁内产生极性。电偶极子通常平行于双壁排列，而面外偶极子是由原子力显微镜（AFM）尖端或衬底中的原子步骤弹性诱导的。分子动力学模型表明，面外偶极子在畴壁附近形成极涡结构。柔性电，例如，通过移动AFM尖端，在这些涡流中产生位移电流。我们估计这些位移电流产生的磁场矩在每原子层10−9 μB左右。
Flexoelectricity in twinned ferroelastic thin films generates polarity inside twin walls. The electrical dipoles are typically aligned parallel to twin walls while out-of-plane dipoles are induced elastically by an atomic force microscopy (AFM) tip or by atomic steps in the substrate. Molecular dynamics modeling shows that the out-of-plane dipoles form polar vortex structures next to the domain walls. Flexoelectricity, e.g., by moving AFM tips, produces displacement currents inside these vortices. We estimate that these displacement currents generate magnetic fields with moments in the order of 10−9 μB per atomic layer.