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相关概念视频

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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Paramagnetism01:30

Paramagnetism

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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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Magnetic Force01:18

Magnetic Force

907
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
907
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
979
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

262
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...
262
Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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强度为2千兆帕斯卡的柔性磁铁具有柔性强度.

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概括

研究人员开发了一种纳米结构方法,可以在不牺牲柔性的情况下,将软磁性材料 (SMM) 的强度提高一倍. 这一突破提高了电机等苛刻应用的机械性能,为更高效和更耐用的设备铺平了道路.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 电磁主义 电磁主义

背景情况:

  • 软磁性材料 (SMM) 对于高效率应用中的机电能量转换至关重要.
  • 电机旋转速度的增加给SMM带来了更大的机械压力.
  • 当前的SMM往往缺乏足够的收益强度 (低于1GPa),有可能降低磁性能和故障.

研究的目的:

  • 为了提高SMM的强度,同时保持其柔性.
  • 开发一个纳米结构策略,以提高SMM的机械强度.
  • 为了使SMM能够在先进的应用中承受更高的机械负载.

主要方法:

  • 采用了一个多元件纳米结构策略.
  • 在热处理过程中通过脱位驱动的沉引入了形态异型的纳米沉物.
  • 在这项研究中使用了一种铁---材料.
  • 沉尺寸被控制在磁域墙壁宽度以下.

主要成果:

  • 实际上,SMM的度强度翻了一番,达到高达2GPa,同时保持柔性.
  • 纳米结构导致了高沉密度,大特定表面积,小的沉间距,和高格子不匹配.
  • 这些特征有效地阻碍了脱位滑动,大大加强了材料.
  • 矩阵和沉物都表现出铁磁性质,确保了高磁矩.

结论:

  • 开发的纳米结构方法成功地提高了SMM的机械性能.
  • 这种策略产生了强 (2GPa) 和柔性SMM,强制性增加了可容忍的强制性.
  • 这些发现为可持续电气化和高性能电机提供了更强大的SMM的途径.