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相关概念视频

Diamagnetism01:26

Diamagnetism

2.5K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.5K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

763
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
763
Paramagnetism01:30

Paramagnetism

2.6K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.6K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

726
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.
726
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

359
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
359
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
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...
1.1K

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相关实验视频

Updated: Sep 16, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

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基于自旋脱元表面的极化改进双向原子磁力计.

Shuo Sun1,2,3,4, Jiahao Zhang1,3,4, Rongtong Zhu1,3,4

  • 1School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, 100191, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|July 7, 2025
PubMed
概括

一种新的双向光学原子磁力计 (OPAM) 使用自旋脱的元表面来改善磁场检测. 这种设计增强了原子极化控制和稳定性,达到1.85 pT/Hz1/2的灵敏度.

关键词:
原子磁力计是一种原子磁力计.双向是一种双向.metasurface 地表的表面是什么通过光学的光学.旋转脱的旋转脱

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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相关实验视频

Last Updated: Sep 16, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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科学领域:

  • 量子传感器是一种量子传感器.
  • 光学和光子学 在光学和光子学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 光学原子磁计 (OPAM) 是一种先进的磁场传感器.
  • 传统的OPAM由于原子极化不均和极化控制不精确而面临限制.

研究的目的:

  • 介绍和实验演示一个双向OPAM,利用一个自旋脱的元表面.
  • 通过提高极化控制和系统稳定性来克服传统OPAM的性能限制.

主要方法:

  • 设计了一个超表面来产生两个反传播的圆极化 (CP) 光和一个线性极化 (LP) 光.
  • 利用CP灯减轻极化梯度,使用LP灯进行高效探测.
  • 实验证明了精确控制原子自旋两极化.

主要成果:

  • 实现了增强的稳定性和减轻了原子细胞内的极化梯度.
  • 提高能源利用效率和简化系统架构.
  • 证明了高精度的磁场测量,灵敏度为1.85 pT/Hz1/2.

结论:

  • 基于超表面的OPAM可实现精确的原子自旋偏振控制.
  • 这种新的方法显著提高了原子磁力计的性能.
  • 在量子精度测量中推进元表面的应用.