• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Subatomic movements of a domain wall in the Peierls potential
【24h】

Subatomic movements of a domain wall in the Peierls potential

机译：Peierls势域中畴壁的亚原子运动

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The discrete nature of crystal lattices plays a role in virtually every material property. But it is only when the size of entities hosted by a crystal becomes comparable to the lattice period-as occurs for dislocations, vortices in superconductors and domain walls-that this discreteness is manifest explicitly. The associated phenomena are usually described in terms of a background Peierls 'atomic washboard' energy potential, which was first introduced for the case of dislocation motion in the 1940s. This concept has subsequently been invoked in many situations to describe certain features in the bulk behaviour of materials, but has to date eluded direct detection and experimental scrutiny at a microscopic level. Here we report observations of the motion of a single magnetic domain wall at the scale of the i individual peaks and troughs of the atomic energy landscape. Our experiments reveal that domain walls can become trapped between crystalline planes, and that they propagate by distinct jumps that match the lattice periodicity. The jumps between valleys are found to involve unusual dynamics that shed light on the microscopic processes underlying domain-wall propagation. Such observations offer a means for probing experimentally the physics of topological defects in discrete lattices-a field rich in phenomena that have been subject to extensive theoretical study.
机译：晶格的离散性质实际上在每种材料特性中都起作用。但是只有当晶体中所含的实体的大小变得与晶格周期相当时（如位错，超导体中的涡旋和畴壁发生时），这种离散才明确地显现出来。通常以背景Peierls的“原子搓板”能量势来描述相关现象，该能量势在1940年代首次用于位错运动。随后，在许多情况下调用了此概念来描述材料的整体行为中的某些特征，但迄今为止，还没有进行微观层面的直接检测和实验检查。在这里，我们报告了单个磁畴壁在原子能态的i个峰和谷的尺度上的运动的观察结果。我们的实验表明，畴壁可能会陷在晶面之间，并且它们会通过与晶格周期相匹配的不同跃迁传播。发现谷之间的跳跃涉及不寻常的动力学，这些动力学揭示了畴壁传播背后的微观过程。这样的观察提供了一种手段来实验性地探测离散晶格中的拓扑缺陷的物理学的方法，该领域是一个现象丰富的领域，已经受到了广泛的理论研究。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号