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相关概念视频

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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...
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Magnetic Vector Potential01:15

Magnetic Vector Potential

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In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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...
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Magnetic Field Of A Current Loop01:16

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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相关实验视频

Updated: Jun 26, 2025

Magnetic Tweezers for the Measurement of Twist and Torque
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在纳米级磁道交叉点中,旋转轨道扭矩向量的量化.

Kiran Kumar Vudya Sethu1,2, Farrukh Yasin1, Johan Swerts1

  • 1IMEC, Kapledreef 75, 3001 Leuven, Belgium.

ACS nano
|May 15, 2024
PubMed
概括

研究人员量化了纳米级SOT磁道连接处的旋转轨道扭矩 (SOT) 组件. 他们发现,场状扭矩明显大于反压扭矩,这对于SOT-MRAM开发至关重要.

关键词:
拉什巴 (Rashba) 效应是造成的.斯通纳-沃尔法尔第一个天体.反阻尼扭矩的反阻尼扭矩类似场状的扭矩.磁道交叉点 磁道交叉点旋转的霍尔效应旋转 - 轨道扭矩.

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相关实验视频

Last Updated: Jun 26, 2025

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科学领域:

  • 这就是Spintronics.
  • 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

背景情况:

  • 旋转轨道扭矩 (SOT) 能够实现超快速,节能的磁化开关,用于SOT-MRAM.
  • 定制SOT组件,反压 (T_AD) 和场状 (T_FL) 扭矩,是先进的SOT-MRAM的关键.
  • 在纳米级设备中量化SOT矢量组件和效率 (χ_AD, χ_FL) 是必不可少的.

研究的目的:

  • 建立一个方法来量化纵向 (T_AD) 和横向 (T_FL) SOT组件及其效率 (χ_AD, χ_FL) 在纳米级三端SOT磁道连接 (SOT-MTJ).
  • 将纳米尺度SOT-MTJ中的SOT效率与微米尺寸设备进行比较.
  • 阐明T_FL在SOT-MTJs中的磁化动态中的主导作用.

主要方法:

  • 通过分析SOT-MTJ中SOT有效场 (B_SOT) 所产生的磁化逆转开关场 (B_SF) 的调制,量化SOT效率 (χ_AD, χ_FL).
  • 使用微磁和宏旋模拟来验证实验结果,并复制Stoner-Wohlfarth天体的行为.
  • 在横向磁场下确定电流诱导磁化切换的门电流.

主要成果:

  • 在纳米级W/CoFeB SOT-MTJ中,发现 χ_FL 是 χ_AD.的两倍.
  • 纳米尺度SOT-MTJ中的 χ_FL是微米尺寸W/CoFeBHall-bar设备中的6倍.
  • 模拟证实 χ_FL > χ_AD 是复制实验SOT-MTJ歇斯底里循环行为所必需的.
  • 在SOT-MTJ磁化动态中,T_FL比T_AD发挥更重要的作用.

结论:

  • 已经建立了一个可靠的方法来量化SOT矢量组件和纳米级SOT-MTJ的效率.
  • 与较大的设备相比,纳米规模的SOT-MTJ显著提高了类似现场的SOT效率.
  • 在纳米级SOT-MTJ中T_FL的突出作用表明了进一步优化SOT-MRAM性能的潜力,非局部自旋电流值得进一步研究.