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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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 in...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
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...

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

単一の磁性ナノ構造内のスピン依存量子干渉

H Oka1, P A Ignatiev, S Wedekind

  • 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle/Saale, Germany.

Science (New York, N.Y.)
|February 13, 2010
PubMed
まとめ
この要約は機械生成です。

ナノ構造における量子干渉は,空間回転の極化変化を引き起こします. この現象は,電子状態の違いから生じ,磁性ナノ構造の振る舞いに影響を与えます.

さらに関連する動画

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

Published on: July 20, 2022

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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

Published on: March 24, 2019

関連する実験動画

Last Updated: Jun 16, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

Published on: July 20, 2022

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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

Published on: March 24, 2019

科学分野:

  • 量子力学は,量子力学という
  • 凝縮物質物理学 凝縮物質物理学
  • 材料科学は材料科学である.

背景:

  • 量子干渉は,量子力学の基本的な現象である.
  • それは通常,閉じ込められたシステムで発生し,電子の行動に影響します.
  • 磁性ナノ構造におけるスピン極化を理解することは,スピントロニクスにとって極めて重要です.

研究 の 目的:

  • 磁性ナノ構造体内のスピン偏振を調節する量子干渉の役割を調査する.
  • サブナノメートルのスケールでスピン偏振の空間的変化を探求する.
  • 観測されたスピン極化変調の背後にある電子メカニズムを明らかにする.

主な方法:

  • スピン極化スキャニングトンネル顕微鏡 (SP-STM) を使用して,スピン極化を検出します.
  • 実験的観測を補完するために,ab initio計算を行う.
  • 異なるスピンチャネルに対する状態の局所密度 (LDOS) を分析する.

主要な成果:

  • 量子干渉による単一の磁性ナノ構造内でのスピン偏振の観測された空間的調節.
  • サブナノメートルのスケールでスピン偏振の記号と大きさの両方で有意な変化が検出されました.
  • 実験結果は,理論的な初期計算によって裏付けられました.

結論:

  • 電子の量子干渉は,スピン偏振の観測された空間的調節に直接責任を負う.
  • 調節は,多数と少数のスピン電子間の状態の空間的に変化する局所密度の違いに起因する.
  • この研究は,ナノスケールの磁性ナノ構造体におけるスピン極化制御に関する洞察を提供します.