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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.5K
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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.2K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.1K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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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
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.1K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Related Experiment Video

Updated: Oct 12, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Spin-constrained optoelectronic functionality in two-dimensional ferromagnetic semiconductor heterojunctions.

Yilv Guo1, Yehui Zhang, Zhaobo Zhou

  • 1School of Physics, Southeast University, Nanjing 211189, China. siesta@seu.edu.cn jlwang@seu.edu.cn.

Materials Horizons
|November 25, 2021
PubMed
Summary

Researchers developed a new spin-constrained optoelectronic device using 2D ferromagnetic semiconductors. This device enables reversible switching of band alignment through magnetization reversal, paving the way for ultra-compact spintronics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Two-dimensional (2D) van der Waals (vdW) engineering has unlocked novel physics and applications.
  • 2D ferromagnetic semiconductors (FMSs) offer unique spintronic properties.

Purpose of the Study:

  • To propose and demonstrate a novel spin-constrained optoelectronic device using 2D FMS heterostructures.
  • To achieve reversible switching of band alignment via magnetization reversal.

Main Methods:

  • Utilizing a photoexcited double-band-edge transition model.
  • Investigating the coupling between interlayer magnetic order and spin-polarized band structure.
  • Demonstrating the device with CrBr3/CrCl3 heterojunctions and other 2D FMSs.

Main Results:

  • A novel spin-constrained optoelectronic device based on 2D FMS heterostructures was proposed.
  • The device exhibits switchable band alignment achieved by reversing magnetization.
  • Successful realization demonstrated with CrBr3/CrCl3 heterojunctions.

Conclusions:

  • This work opens new avenues for 2D vdW heterostructures in optoelectronics.
  • The developed device enables the possibility of fully vdW-based ultra-compact spintronics.