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裂噪声显微镜的使用方法

Cam-Phu Thi Nguyen1, Peggy Schoenherr1,2, Ekhard K H Salje3

  • 1School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW, 2052, Australia.

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|August 16, 2023
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概括
此摘要是机器生成的。

破裂噪声,在材料中是一种普遍的现象,现在可以使用破裂噪声显微镜在纳米尺度上测量. 这种新技术揭示了铁电域壁的雪崩行为改变.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 非线性动力学是一种非线性动力学.

背景情况:

  • 裂裂噪声是驱动非线性系统中规模不变的现象,其特点是继电力定律分布后出现雪崩般的事件.
  • 这种现象最初被观察到是磁性材料中的巴克豪森噪声,在包括地质物理学,材料工程和统计物理学在内的各种领域都很重要.
  • 了解声对于描述外部刺激下的复杂材料系统的动态至关重要.

研究的目的:

  • 开发和演示一种用于纳米级裂噪声测量的新方法.
  • 为了研究单个纳米尺度特征的动态,特别是铁电域壁.
  • 探索纳米尺度特征如何影响声的普遍缩放规律.

主要方法:

  • 使用原子力显微镜 (AFM) 纳米沉积用于精确的力应用和位移测量.
  • 开发一种称为"声显微镜"的技术,以探测单个纳米尺度特征.
  • 分析了在纳米沉积过程中产生的雪崩的大小和分布.

主要成果:

  • 成功测量了使用AFM纳米沉积的单个铁电域壁的纳米级声.
  • 与散装域相比,观察到纳米级拓缺陷下雪崩的临界指数发生变化.
  • 在这些纳米尺度特征上表现出混合关键性的抑制,偏离了散装行为.

结论:

  • 裂噪声显微镜为研究材料中的纳米尺度现象提供了一个强大的新工具.
  • 铁电领域墙壁表现出明显的动态,影响关键指数和混合关键性.
  • 这种方法具有广泛的适用性,用于研究各种单独的纳米级材料系统中的声.