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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

2.5K
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...
2.5K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

1.1K
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...
1.1K
Magnetic Damping01:17

Magnetic Damping

458
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...
458
Motional Emf01:22

Motional Emf

3.2K
Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
3.2K
Diamagnetism01:26

Diamagnetism

2.4K
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....
2.4K

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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
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在永久磁铁上使用磁性MEMS加热过程中的强迫力变化进行批量精细磁性图案传输方法.

Keita Nagai1, Naohiro Sugita2, Tadahiko Shinshi2

  • 1Department of Mechanical Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.

Micromachines
|February 24, 2024
PubMed
概括

一种新的磁性模式转移 (MPT) 方法使微电子机械系统 (MEMS) 磁铁的微型多极磁化成为可能. 这种技术克服了自我去磁化问题,提高了磁流密度,提高了设备性能.

关键词:
NdFeB磁铁的使用方法激光辅助加热是一种激光辅助加热.磁性MEMS是一种磁性MEMS.转移磁性图案的转移磁性图案的转移.微磁化是一种微磁化.多极磁化 多极磁化

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科学领域:

  • 材料科学 材料科学 材料科学
  • 物理 物理学 物理
  • 工程 工程师 工程师 工程师

背景情况:

  • 磁性微电机械系统 (MEMS) 使用永久磁铁,但它们的形状会导致自我去磁,限制性能.
  • 现有的削弱自我消磁场的方法,如细分或多极磁化,在量产和可实现的磁流密度方面存在局限性.

研究的目的:

  • 为MEMS磁铁提出和演示一批精细的多极磁模式传输 (MPT) 方法.
  • 与传统方法相比,为了达到更高的表面磁流密度.
  • 开发一种适合大规模生产图案磁铁的技术.

主要方法:

  • 拟议的MPT方法涉及将目标磁铁放在具有相同图案的两个主磁铁之间.
  • 通过激光辅助加热来降低目标磁铁的强制性,从而允许图案传输.
  • 各种图案 (条纹,棋盘,同心圆) 杆距0.3毫米被磁化在NdFeB主磁铁 (N38EH) 上,并转移到NdFeB目标磁铁 (N35).

主要成果:

  • 该MPT方法成功地将磁性图案转移到NdFeB目标磁铁上.
  • 最高的表面磁流密度是在160°C时实现的.
  • 转移的图案达到目标磁铁的理想磁化图案的39.7-66.1%.

结论:

  • 批量精细多极MPT方法是制造用于MEMS设备的高性能磁铁的可行技术.
  • 这种方法为克服自我去磁化的局限性和提高输出功率提供了一条途径.
  • 该技术显示出大量生产复杂磁图案的潜力.