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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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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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Magnetic Susceptibility and Permeability01:31

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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.
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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.
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Motional Emf01:22

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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...
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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.
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Batch Fine Magnetic Pattern Transfer Method on Permanent Magnets Using Coercivity Change during Heating for Magnetic

Keita Nagai1, Naohiro Sugita2, Tadahiko Shinshi2

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

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|February 24, 2024
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Summary

A new batch magnetic pattern transfer (MPT) method enables fine multi-pole magnetization for microelectromechanical systems (MEMS) magnets. This technique overcomes self-demagnetization issues, enhancing magnetic flux density for improved device performance.

Keywords:
NdFeB magnetlaser-assisted heatingmagnetic MEMSmagnetic pattern transfermicromagnetizationmulti-pole magnetization

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Area of Science:

  • Materials Science
  • Physics
  • Engineering

Background:

  • Magnetic microelectromechanical systems (MEMS) utilize permanent magnets, but their shape causes self-demagnetization, limiting performance.
  • Existing methods for weakening self-demagnetization fields, like segmentation or multi-pole magnetization, have limitations in mass production and achievable magnetic flux density.

Purpose of the Study:

  • To propose and demonstrate a batch fine multi-pole magnetic pattern transfer (MPT) method for MEMS magnets.
  • To achieve higher surface magnetic flux density compared to traditional methods.
  • To develop a technique suitable for mass production of patterned magnets.

Main Methods:

  • The proposed MPT method involves sandwiching a target magnet between two master magnets with identical patterns.
  • Target magnet coercivity is reduced via laser-assisted heating, allowing pattern transfer.
  • Various patterns (stripe, checkerboard, concentric circle) with 0.3 mm pole pitch were magnetized on NdFeB master magnets (N38EH) and transferred to NdFeB target magnets (N35).

Main Results:

  • The MPT method successfully transferred magnetic patterns to NdFeB target magnets.
  • The highest surface magnetic flux density was achieved at 160 °C.
  • The transferred patterns reached 39.7-66.1% of the ideal magnetization pattern on the target magnets.

Conclusions:

  • The batch fine multi-pole MPT method is a viable technique for fabricating high-performance magnets for MEMS devices.
  • This method offers a pathway to overcome self-demagnetization limitations and enhance output power.
  • The technique shows potential for mass production of complex magnetic patterns.