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三维原子探针的电场结构模拟研究

李依轩，刘俊亮*，王 伟，于得洋，徐先东*
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2024年 第43卷 第2期: 1000-6281（2024）02-173-07     下载地址：

三维原子探针的电场结构模拟研究

李依轩，刘俊亮*，王  伟，于得洋，徐先东*

（1.湖南大学 材料科学与工程学院,湖南 长沙 410082; 2.中国科学院近代物理研究所，甘肃 兰州 730000; 3.中国科学院大学 核科学与技术学院，北京 100049)

摘要  本文针对目前世界上被广泛使用的局部电极原子探针的样品及局部电极几何结构，通过有限元方法，结合多物理场仿真技术，研究了局部电极与针状样品的距离z、样品尖端曲率半径ρ 、局部电极的入口直径φ、厚度w、开口角度α和入口长度h等参数对样品尖端附近的局部电场的影响。模拟结果表明：当z与φ的取值满足z/φ≥1时，既能在样品尖端得到较高的蒸发电场强度，又能降低局部电极对离子轨迹的影响；局部电极的厚度w和开口角度α的取值对样品尖端的电场影响较小；增大局部电极入口长度h的值有利于提高样品尖端电场强度；随着原子的蒸发(样品尖端曲率半径ρ增大)，为维持原子蒸发所需的电场强度，施加在样品上的电压V与样品尖端的曲率半径ρ成正比，且所需维持的电场强度越高，施加的电压V越大。

关键词  三维原子探针；局部电极；有限元模拟；电场结构；离子轨迹

中图分类号：O766+.1; O657.63; O463+.2    文献标识码：A            doi:10.3969/j.issn.1000-6281.2024.02.006

 

Simulation of the electric field structure of a three-dimensional atom probe

LI Yixuan1, 2, LIU Junliang2, 3*, WANG Wei2, 3, YU Deyang2, 3, XU Xiandong1*

（1. College of Materials Science and Engineering, Hunan University, Changsha Hunan 410082; 2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou Gansu 730000; 3. College of Nuclear Science and Technology, University of the Chinese Academy of Sciences, Beijing 100049, China)

Abstract    This article employed the finite element method and multiphysics simulation to analyze the structure of a local electrode atom probe. The impact of various parameters, including inlet diameter (φ), thickness (w), opening angle (α), entrance length (h) of the local electrode, the radius of curvature  (ρ) of the specimen, and the distance (z) between the local electrode and the needle-shaped specimen on the local electric field structure near the apex of a specimen, was investigated. The results indicated that a higher evaporation electric field strength was achieved at the apex of the specimen, and the influence of local electrode on ion trajectories was reduced when the ratio of distance (z) to inlet diameter (φ) satisfied z/φ≥1. Specifically, the thickness (w) and opening angle (α) of the local electrode had a minimal impact on the electric field at the apex of the specimen. In contrast, the increase of the entrance length (h) of the local electrode improved the electric field strength at the apex of the specimen. Moreover, the radius of curvature (ρ) of the specimen increased as atoms continued to evaporate from the specimen surface. The electric field (V) applied to the specimen was proportional to the radius of curvature (ρ) of the specimen to maintain the required electric field intensity. The higher intensity of electric field corresponded to the greater applied electric field (V).

Keywords   atom probe tomography; local electrode; finite element simulation; electric field structure; ion trajectory

 

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