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相关概念视频

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
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...
1.9K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.2K
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.
1.2K
Valence Bond Theory02:42

Valence Bond Theory

11.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.1K
Diamagnetism01:26

Diamagnetism

2.9K
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....
2.9K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.4K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.4K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

1.1K
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...
1.1K

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相关实验视频

Updated: Jan 6, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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使用旋转纠正效应,探测曲面轻平面反铁磁体中的非线性旋转动力学.

A El Kanj1, S Mantion1, I Boventer1

  • 1Université Paris-Saclay, Laboratoire Albert Fert, CNRS, Thales, 91767 Palaiseau, France.

Physical review letters
|October 25, 2025
PubMed
概括

我们发现,Dzyaloshinskii-Moriya相互作用在倾斜的反铁磁体中增强了自转校正. 这项研究提高了对变磁材料和自旋电子设备动态的理解.

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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科学领域:

  • 这就是Spintronics.
  • 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:

  • 旋转纠正现象对于旋转器件至关重要.
  • 倾斜的反铁磁体和变磁材料提供独特的磁性.
  • 了解Dzyaloshinskii-Moriya相互作用是控制旋转动态的关键.

研究的目的:

  • 为了研究倾斜反铁磁体中的自旋校正现象.
  • 探索Dzyaloshinskii-Moriya相互作用在提高激发效率中的作用.
  • 分析对称性和检测机制对整正电压的影响.

主要方法:

  • 关于旋转纠正效应的实验研究.
  • 使用自旋哈尔磁阻和玻利米特效应进行检测.
  • 在不同的条件下分析反铁磁力学动态.

主要成果:

  • 通过Dzyaloshinskii-Moriya相互作用,激发效率显著提高.
  • 检测到的抗铁磁动力学效率高达mV/W.
  • 校正电压取决于扭矩对称性,检测方法和晶体轴.
  • 在高功率的反铁磁共振中观察到和效应和非线性红移.

结论:

  • 兹亚洛辛斯基-莫里亚相互作用是倾斜反铁磁体中高效旋转整顿的一个关键因素.
  • 斯宾霍尔磁阻和玻利米效应是反铁磁动力学的可行检测方法.
  • 像自旋波不稳定性和共振红移这样的非线性效应在高功率下发生.
  • 这些发现为在反铁磁和变磁自旋电子学中进行先进的非线性动力学研究铺平了道路.