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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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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Torque01:10

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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.
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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
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Paramagnetism01:30

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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在垂直磁化的材料中转换轨道扭矩.

Yuhe Yang1, Ping Wang2,3, Jiali Chen4,5

  • 1School of Material Science and Engineering, Tiangong University, Tianjin, 300387, China.

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(Zr) 在切换磁性材料方面表现出高轨道扭矩效率. 这项研究突出了Zrr.

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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:

  • 轨道霍尔效应对于开发先进的轨道电子设备至关重要.
  • 对于下一代电子产品来说,研究磁性切换的高效方法至关重要.

研究的目的:

  • 为了研究 (Zr) 作为轨道霍尔材料的轨道扭矩效率.
  • 为了证明垂直磁化材料的切换,使用Zr.
  • 为了比较Zr的性能与现有的材料,如CoFeB/Gd/CoFeB和 (W).

主要方法:

  • 在基于Zr的异构结构中对轨道扭矩效率的实验研究.
  • 垂直磁化 [Co/Pt]3 和 CoFeB/Gd/CoFeB 样品的制造.
  • 测量磁化切换电流密度的测量.
  • 理论计算以了解旋转轨道相关性强度.

主要成果:

  • 在Zr/[Co/Pt]3中达到约0.78的轨道扭矩效率,明显高于CoFeB/Gd/CoFeB中的0.04.
  • 证明了[Co/Pt]3的完全磁化切换使用Zr,电流密度为2.6×10^6 A/cm^2.
  • 在切换效率方面,Zr超过了传统的W spin Hall材料.

结论:

  • Zr是一种高效的轨道霍尔材料,用于磁性切换.
  • 提高的效率与Zr/[Co/Pt]3.3中更强的旋转轨道相关性有关.
  • 这些发现为开发节能轨道电子设备提供了一条道路.