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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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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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Semiconductors

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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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
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Colors and Magnetism03:02

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Color in Coordination Complexes
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Types of Semiconductors01:20

Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

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Two-dimensional chalcogenide-based ferromagnetic semiconductors.

Yanling Wu1, Jun Li1, Yong Liu1

  • 1State Key Laboratory of Metastable Materials Science and Technology & Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 21, 2022
PubMed
Summary
This summary is machine-generated.

Two-dimensional (2D) ferromagnetic (FM) semiconductors are crucial for spintronics. This review highlights 2D chalcogenide-based FM semiconductors, emphasizing their potential for room-temperature applications.

Keywords:
chalcogenide-basedferromagnetismsemiconductortwo-dimensional

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) magnetic materials are gaining significant attention for their unique physical properties.
  • The pursuit of room-temperature ferromagnetic (FM) semiconductors in 2D materials is critical for advanced spintronics.
  • Intrinsic ferromagnetism in 2D materials, tunable by external fields, shows great application promise.

Purpose of the Study:

  • To review various types of 2D chalcogenide-based FM semiconductors.
  • To compare their physical properties, including crystal and electronic structures, and mechanical stability.
  • To summarize recent advancements in theoretical predictions and experimental regulation of 2D FM semiconductors.

Main Methods:

  • Literature review of 2D chalcogenide-based FM semiconductors.
  • Summary and comparison of material properties (crystal structure, electronic structure, mechanical stability).
  • Analysis of theoretical models for 2D magnetism and experimental regulation methods.

Main Results:

  • 2D chalcogenide-based FM semiconductors exhibit high Curie temperatures (Tc) and structural stability.
  • These materials demonstrate potential for achieving room-temperature ferromagnetism at atomic-layer thickness.
  • Tunability of magnetism via external fields is a key feature.

Conclusions:

  • 2D chalcogenide-based FM semiconductors are promising candidates for room-temperature spintronics devices.
  • Their inherent stability and high Curie temperatures are significant advantages.
  • Further research in theoretical prediction and experimental control will advance their application.