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相关概念视频

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

661
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...
661
Ferromagnetism01:31

Ferromagnetism

2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

655
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.
655
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

924
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...
924
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

955
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...
955
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

1.1K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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相关实验视频

Updated: Jul 5, 2025

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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旋转扭矩驱动的反铁磁共振是一种反铁磁共振.

Yongjian Zhou1, Tingwen Guo1,2, Lei Han1

  • 1Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.

Science advances
|January 12, 2024
PubMed
概括
此摘要是机器生成的。

研究人员在室温下实现了旋转扭矩驱动的反铁磁共振 (ST-AFMR). 这一突破使尼尔向量的控制和检测成为可能,为更快的反铁磁自旋电子设备铺平了道路.

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

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Magnetic Tweezers for the Measurement of Twist and Torque
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科学领域:

  • 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
  • 这就是Spintronics.

背景情况:

  • 反铁磁螺旋电子技术提供了高速数据处理的潜力,因为其内在的快速动态.
  • 超快自旋电流对于访问和理解反铁磁自旋动力学至关重要.
  • 旋转扭矩驱动的反铁磁共振 (ST-AFMR) 对于实际应用是可取的,但在 Néel 矢量控制和检测方面存在挑战.

研究的目的:

  • 在材料系统中实验观察和描述旋转扭矩驱动的反铁磁共振 (ST-AFMR).
  • 通过ST-AFMR来证明Neel载体的控制和检测.
  • 探索ST-AFMR在开发先进反铁磁自旋电子装置方面的潜力.

主要方法:

  • 在室温下在Y3Fe5O12/α-Fe2O3/Pt异构中对ST-AFMR的实验观察.
  • 利用反铁磁负旋转的霍尔磁阻诱导的旋转纠正效应用于信号生成.
  • 采用微磁模拟来分析尼尔向量的共振行为和倾斜的时刻.

主要成果:

  • 在Y3Fe5O12/α-Fe2O3/Pt系统中成功观察了ST-AFMR.
  • 与铁磁铁相比,证明了Néel向量的振荡有助于产生具有相反标志的可测量的电压信号.
  • 在α-Fe2O3的尼尔向量和Y3Fe5O12缓冲层的磁化之间建立了强大的合,以方便控制.
  • 微磁模拟证实了Neel向量的圆共振和α-Fe2O3.3中的斜矩.

结论:

  • 这项研究证明了ST-AFMR在室温下的可行性,克服了以前的局限性.
  • 这些发现突出了反铁磁铁在发电信号的反铁磁铁中旋转纠正效应的作用.
  • 这项工作代表了向电控反铁磁太赫兹发射器和先进的自旋电子设备迈出的重要一步.