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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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Torque01:10

Torque

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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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 Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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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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Ferromagnetism01:31

Ferromagnetism

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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...
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相关实验视频

Updated: Mar 27, 2026

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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由拓绝缘体产生的旋转转移扭矩.

A R Mellnik1, J S Lee2, A Richardella2

  • 1Cornell University, Ithaca, New York 14853, USA.

Nature
|July 25, 2014
PubMed
概括

拓绝缘体,如甲化物,通过旋转转移扭矩有效地控制磁性材料. 这一突破可能会导致先进的,低功率的磁性内存和逻辑设备.

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Magnetic Tweezers for the Measurement of Twist and Torque
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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:

  • 磁性设备提供非挥发性,高密度,高速,耐用性内存和逻辑解决方案.
  • 有效的电流驱动磁化操纵对于磁性技术的广泛采用至关重要.
  • 通过旋转霍尔或拉什巴-埃德尔斯坦效应,旋转轨道相互作用是电流驱动扭矩的关键机制.

研究的目的:

  • 研究拓绝缘体的潜力,特别是树脂化物 (Bi2Se3) 对高效的旋转轨道诱导扭矩的潜力.
  • 通过实验证明电流驱动的旋转转移扭矩从拓绝缘体表面状态到相邻的铁磁层.
  • 为了评估Bi2Se3作为用于磁性操纵的旋转轨道扭矩源的效率.

主要方法:

  • 薄膜的制造包括一个拓绝缘体 (Bi2Se3) 和一个铁磁体 (常态合金,Ni81Fe19).
  • 在室温下进行电传输测量,以检测电流诱导的磁效应.
  • 分析每单位充电电流密度的扭矩强度.

主要成果:

  • 在Bi2Se3中的电荷电流在相邻的Ni81Fe19膜上产生了强大的旋转转移扭矩.
  • 观察到的扭矩方向与拓绝缘体表面状态的预测保持一致.
  • 在Bi2Se3中的扭矩效率超过了之前报告的旋转转移扭矩源,即使在带有散装导体的膜中也是如此.

结论:

  • 拓绝缘体,如Bi2Se3,是旋转转移扭矩的高效来源.
  • 这项研究证明了使用拓绝缘体的可行性,以高效地对磁性材料进行电气操作.
  • 这些发现表明,开发下一代低功耗磁性存储器和在室温下运行的逻辑设备是一个有希望的途径.