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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

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

Spin–Spin Coupling Constant: Overview

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 have a...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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

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

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...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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関連する実験動画

Updated: Jun 27, 2026

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies
08:21

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies

Published on: March 20, 2015

ダブルポイントコンタクトのスピン転送装置のフェーズロック.

F B Mancoff1, N D Rizzo, B N Engel

  • 1Technology Solutions Organization, Freescale Semiconductor Inc., Chandler, Arizona 85224, USA. fred.mancoff@freescale.com

Nature
|September 16, 2005
PubMed
まとめ
この要約は機械生成です。

スピン・トランスファー・トルクにより,磁気振動のフェーズロックが密接な距離にある磁気点コンタクトで可能になります. この同期は出力力を向上させ,高度なマイクロ波振動器とメモリデバイスの道を開く.

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

関連する実験動画

Last Updated: Jun 27, 2026

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies
08:21

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies

Published on: March 20, 2015

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Published on: January 19, 2018

科学分野:

  • スピントロニクス (Spintronics) は,スピントロニクス (Spintronics) を開発したものです.
  • 凝縮物質物理学 凝縮物質物理学
  • ナノテクノロジー ナノテクノロジー

背景:

  • スピン・トランスファー・トルクは,スピン・ポラライズされた電流と磁気材料の相互作用から生じる.
  • 以前の実験では,電流密度が高い磁気装置における磁気化の逆転または前退が実証されました.
  • スピン転送デバイスは,磁気ランダムアクセスメモリとマイクロ波振動器の有望性を保持しています.

研究 の 目的:

  • 結合された巨大磁力抵抗 (GMR) ポイントコンタクトにおける磁化振動の相鎖の振る舞いを調査する.
  • 接触距離がスピン転送装置の共振周波数と出力に与える影響を測定する.

主な方法:

  • 80nm直径の2つのGMRポイントコンタクトの製造,異なる距離 (200nm未満から400nm以上).
  • スピン転送電流によって誘発される磁気振動の測定.
  • 接触距離の関数としての共振周波数と出力力の分析.

主要な成果:

  • マグネティゼーションの振動を単一の共振に相ロックすることは,約200 nm未満の接触間隔で観察されました.
  • フェーズロック共振周波数は,10GHz以下から24GHzを超える範囲でした.
  • 狭い距離のコンタクト (フェーズロック) は,別々の共鳴を持つ広い距離のコンタクトと比較して約2倍の出力を示しました.

結論:

  • 近い距離のGMR点接触でスピン転送誘発磁気振動の相ロックが達成可能である.
  • このフェーズロック現象は,出力量の大幅な増加につながり,マイクロ波振動器のアプリケーションの強化の可能性を示唆しています.
  • カップルされたスピン転送装置のフェーズロックを制御する能力は,高度なスピントロニックアプリケーションのための大規模な同期配列の開発を可能にすることができます.