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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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Updated: Feb 1, 2026

Light-driven Enzymatic Decarboxylation
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Light-driven Enzymatic Decarboxylation

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アルテル磁性体駆動のマグノン・スピン分裂ネルンスト効果

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.

Physical review letters
|January 30, 2026
PubMed
まとめ
この要約は機械生成です。

アルテル磁性体は、磁場やDMIなしでマグノンスピン電流を生成できます。研究者らはLuFeO3フィルムでマグノンスピン分裂ネルンスト効果を実証し、そのスピントロニクスにおける可能性を強調しました。

キーワード:
アルテル磁性体マグノンスピン分裂ネルンスト効果スピントロニクスLuFeO3

さらに関連する動画

From MEFs to Matrigel 2: Splitting hESCs from MEFs onto Matrigel
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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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From MEFs to Matrigel 2: Splitting hESCs from MEFs onto Matrigel
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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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科学分野:

  • 物性物理学
  • スピントロニクス
  • 材料科学

背景:

  • 反磁性体におけるマグノンスピン電流の生成には、通常、強力な磁場またはDzyaloshinskii-Moriya相互作用（DMI）が必要です。
  • 運動量依存のスピン分裂バンドを持つ反磁性体の一種であるアルテル磁性体は、スピン電流生成の新しいルートを提供します。
  • これらの材料は、外部磁場やDMIの必要性を回避します。

研究 の 目的:

  • アルテル磁性体フィルムにおけるマグノン・スピン分裂ネルンスト効果（MSSNE）を実証すること。
  • アルテル磁性体におけるマグノンスピン電流の生成を調査すること。
  • MSSNEがスピン分裂マグノンバンドに由来することの証拠を提供すること。

主な方法:

  • LuFeO3フィルムの作製。
  • 縦方向の温度勾配の印加。
  • 横方向のマグノンスピン電流の測定。
  • 発見を裏付けるための対称性解析。

主要な成果:

  • LuFeO3におけるマグノン・スピン分裂ネルンスト効果（MSSNE）の実証に成功しました。
  • 縦方向の温度勾配による横方向のマグノン・スピン電流の生成。
  • MSSNEがDMIではなく、スピン分裂マグノンバンドに由来することを確認する4つの証拠。

結論:

  • 本研究は、アルテル磁性体LuFeO3フィルムにおけるMSSNEを確認しました。
  • アルテル磁性体は、磁場フリーのマグノンスピン電流生成のための新しいプラットフォームを提供します。
  • これらの発見は、反磁性スピントロニクス応用におけるアルテル磁性体の可能性を強調しています。