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相关概念视频

Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Magnetic Flux01:18

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The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
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Divergence and Curl of Magnetic Field01:26

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The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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在衍射极限以下的宽带共变磁体测量.

Xuan Hoang Le1,2, Pavel E Dolgirev1, Piotr Put1,2

  • 1Harvard University, Department of Physics, Cambridge, Massachusetts 02138, USA.

Physical review letters
|November 7, 2025
PubMed
概括

研究人员开发了一种纳米级磁传感技术,使用钻石中的两个空位 (NV) 中心. 这种方法可以实现宽带磁信号相关性测量的亚衍射空间分辨率.

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科学领域:

  • 量子传感和计量学 量子传感和计量学
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米级磁场传感器 纳米级磁场传感器

背景情况:

  • 测量具有高空间分辨率的相关磁信号对于理解复杂的凝聚物质现象至关重要.
  • 传统的磁传感技术往往受到光学衍射极限的限制.
  • 钻石中的空 (NV) 中心提供了有前途的纳米级传感能力.

研究的目的:

  • 实验性地展示一种用于测量宽带磁信号相关性与纳米空间分辨率的新方法.
  • 使用NV中心,以低于光学衍射极限的空间分辨率.
  • 调查高频相关性及其相关动态.

主要方法:

  • 用钻石中的两个空 (NV) 中心作为空间分辨率的纳米级磁力计.
  • 采用光谱分辨率为NV中心读取的不均光学转换.
  • 杆高保真度光学读数和长旋转连贯时间用于敏感测量.

主要成果:

  • 实现了微衍射空间分辨率,用于测量相关的磁信号.
  • 对于千兆赫兹范围的噪声相关性,其被证明的灵敏度为15 nTHz ^ {-1/4} .
  • 通过T_{1}放松计实现了千兆赫兹范围的噪声相关性测量,揭示了连贯和不连贯的动态.

结论:

  • 开发的技术为探测凝聚物质系统中的非局部相关性提供了一个强大的新工具.
  • 测量高频相关性的能力为研究超辐射等现象开辟了道路.
  • 这项工作推进了纳米级磁传感和相关性光谱学.