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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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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
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Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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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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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
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Emerging two-dimensional ferromagnetic semiconductors.

Denan Kong1, Chunli Zhu2, Chunyu Zhao1

  • 1Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, School of Physics, Beijing Institute of Technology, Beijing, 10081, China. jdzhou@bit.edu.cn.

Chemical Society Reviews
|October 15, 2024
PubMed
Summary
This summary is machine-generated.

Emerging two-dimensional (2D) ferromagnetic semiconductors (FMSs) offer exciting possibilities for next-generation electronics. This review summarizes their structures, properties, preparation, and applications in spintronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) semiconductors are crucial for advancing electronics beyond Moore's Law.
  • 2D ferromagnetic semiconductors (FMSs) enable manipulation of both charge and spin for novel spintronic devices.

Purpose of the Study:

  • To provide a comprehensive review of emerging 2D FMSs.
  • To cover atomic structures, physical properties, preparation methods, growth mechanisms, magnetism modulation, and applications.

Main Methods:

  • Literature review of recent advancements in 2D FMS research.
  • Analysis of atomic structures and magnetic properties.
  • Summary of growth techniques and magnetism control.

Main Results:

  • Detailed overview of novel 2D FMSs, including their structures and properties.
  • Exploration of exotic physical properties unique to 2D FMSs.
  • Summary of growth mechanisms and techniques for modulating magnetism.

Conclusions:

  • 2D FMSs present significant potential for spintronic devices and high-density data storage.
  • Further research is needed to overcome challenges and fully realize the applications of 2D FMSs.