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相关概念视频

The Nernst Equation02:59

The Nernst Equation

46.9K
Nonstandard Reaction Conditions
The interconnection between standard cell potentials and various thermodynamic parameters such as the standard free energy change ΔG° and equilibrium constant K has been previously explored. For example, a redox reaction involving zinc(II) and tin(II) ions at 1 M concentration with Eºcell = +0.291 V and ΔG° = −56.2 kJ is spontaneous.
46.9K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.2K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.2K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
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...
1.5K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.7K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K

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电磁变频驱动的马格农旋转分裂的Nernst效应

Yuben Yang1, Di Wang1, Bin Yang1

  • 1Nanjing University, Collaborative Innovation Center of Advanced Microstructures and Department of Physics, National Laboratory of Solid State Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Jiangsu Physical Science Research Center, Institute of Atom Manufacturing, Nanjing 210093, People's Republic of China.

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概括
此摘要是机器生成的。

变磁器可以在没有磁场或DMI的情况下产生磁旋电流. 研究人员在LuFeO3薄膜中展示了磁旋分裂纳恩斯特效应,突出了它们的旋转潜力.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 这就是Spintronics.
  • 材料科学 材料科学 材料科学

背景情况:

  • 在反铁磁体中产生磁旋电流通常需要强磁场或Dzyaloshinskii-Moriya相互作用 (DMI).
  • 变磁体是一种带有动量依赖的自旋分裂带的反铁磁体,为自旋电流生成提供了一条新的路线.
  • 这些材料绕过了对外部磁场或DMI的需求.

研究的目的:

  • 为了证明 LuFeO3 薄膜中的马格农旋转分裂纳恩斯特效应 (MSSNE).
  • 为了研究在变磁体中产生磁旋转电流的过程.
  • 提供来自自旋分裂磁带的MSSNE的证据.

主要方法:

  • 制造LuFeO3薄膜. 制造LuFeO3薄膜. 制造LuFeO3薄膜. 制造LuFeO3薄膜. 制造LuFeO3薄膜.
  • 应用一个纵向温度梯度.
  • 测量横向的马格尼克旋转电流.
  • 对称性分析以支持发现.

主要成果:

  • 在LuFeO3.3中成功证明了磁旋分裂纳斯特效应 (MSSNE).
  • 通过纵向温度梯度生成一个横向的马格尼克旋转电流.
  • 四种类型的证据证实MSSNE来自自旋分裂的磁带,而不是DMI.

结论:

  • 这项研究证实了MSSNE在变磁LuFeO3薄膜中的存在.
  • 变磁器为无场磁旋电流的产生提供了一个新的平台.
  • 这些发现凸显了变磁体在反铁磁自旋电子应用中的潜力.