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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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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

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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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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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...
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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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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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2D Magnetic Heterostructures and Their Interface Modulated Magnetism.

Wei Li1, Yi Zeng1, Zijing Zhao1

  • 1Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), School of Materials Science and Engineering, Peking University, Beijing 100871, China.

ACS Applied Materials & Interfaces
|October 22, 2021
PubMed
Summary

Two-dimensional (2D) magnetic heterostructures offer exciting possibilities for novel spintronic devices. Research explores fabrication methods and interface effects, paving the way for advanced applications.

Keywords:
construction methodsinterfacial couplingmagnetic heterostructuresmagnetic proximity effecttwo-dimensional

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) magnetic heterostructures are gaining significant interest.
  • They offer unique platforms for studying interfacial magnetic coupling and magnetism modulation in 2D materials.
  • These heterostructures are crucial for developing novel spintronic device applications.

Purpose of the Study:

  • To review dominant synthetic strategies for fabricating 2D magnetic heterostructures.
  • To analyze magnetic-nonmagnetic and magnetic-magnetic interfaces.
  • To discuss interface-modulated magnetism and device applications.

Main Methods:

  • Introduction of prevailing synthetic strategies for 2D magnetic heterostructure fabrication.
  • Focus on analyzing magnetic-nonmagnetic and magnetic-magnetic interfaces.
  • Review of interface-modulated phenomena like valley splitting and anomalous Hall effect.

Main Results:

  • Discussion of various interface-modulated magnetisms, including valley splitting and the anomalous Hall effect.
  • Exploration of device applications, such as magnetic tunnel junctions.
  • Summary of recent advancements in the field.

Conclusions:

  • 2D magnetic heterostructures are a rapidly developing field with significant potential.
  • Interface engineering is key to unlocking novel magnetic properties and functionalities.
  • Future research directions point towards further exploitation of these materials in spintronics.