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相关概念视频

Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
2.2K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.3K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.3K
Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

3.5K
The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
3.5K
Electric Field of a Non Uniformly Charged Sphere01:22

Electric Field of a Non Uniformly Charged Sphere

2.4K
Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known.
Consider a non-uniformly charged sphere, for which the density of charge depends only on the distance from a point in space and not on the direction. Such a sphere has a spherically symmetrical charge distribution. Here, the electric...
2.4K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

2.5K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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相关实验视频

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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电流辅助核化零场霍环的电流辅助核化

Xiaowen Chen1,2, Dongsheng Song3,4, Filipp N Rybakov5

  • 1Spin-X Institute, School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, South China University of Technology, Guangzhou, China.

Advanced materials (Deerfield Beach, Fla.)
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PubMed
概括
此摘要是机器生成的。

研究人员开发了一种简单的电流方法,以创建稳定的磁,这是结结的自旋结构. 这种新技术独立于样品的形状和大小,为磁性材料研究提供了突破性进展.

关键词:
同类型组的同类型组是同类型组.有希望的孩子们洛伦茨传输电子显微镜电子显微镜微磁仿真微磁仿真是一种微磁仿真.斯基尔米昂斯斯基尔米昂斯

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学

背景情况:

  • 磁性hopfions是3D拓单元,具有结结的,类似旋的旋转配置.
  • 在奇拉磁体中,可以将霍普菲安分离或与斯基米安弦连接起来.
  • 以前的核化方法复杂且依赖样本.

研究的目的:

  • 引入一种简单,多功能,电流辅助的协议,用于核化磁吸管.
  • 为了研究这些hopfions在不同磁场下的稳定性.
  • 为拓旋转结构建立一个全面的分类框架.

主要方法:

  • 开发一个电流辅助核化协议.
  • 实验观察形成和稳定性的实验观察.
  • 用于验证的微磁模拟.
  • 用于分类的同型组的导出.

主要成果:

  • 电流方法成功地以独立于样本几何形状的形式核化了希望子.
  • 在正磁场和负磁场之间,Hopfions表现出了异常的稳定性.
  • 微磁模拟证实了实验发现.
  • 建立了一个理论框架来分类鱼,鱼和鱼.

结论:

  • 电流辅助协议提供了一种简化和可扩展的方法来产生磁电.
  • 发现的Hopfions表现出强大的稳定性,对于潜在的应用至关重要.
  • 开发的分类框架增强了对磁系统中的拓旋转纹理的理解.