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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
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...
2.4K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

973
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...
973
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
Diamagnetism01:26

Diamagnetism

2.5K
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....
2.5K
Types Of Superconductors01:28

Types Of Superconductors

1.1K
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...
1.1K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.5K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.5K

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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Coherent antiferromagnetic spintronics.

Jiahao Han1, Ran Cheng2,3, Luqiao Liu4

  • 1Research Institute of Electrical Communication, Tohoku University, Sendai, Japan. jiahao.han.c8@tohoku.ac.jp.

Nature Materials
|March 21, 2023
PubMed
Summary
This summary is machine-generated.

Coherent dynamics in antiferromagnets enable advanced spintronic devices. This review explores spin coherence for novel applications in spin-transfer, spin-orbit, and spin-caloritronics.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Antiferromagnets are promising for spintronics, with established fields like spin-orbitronics, spin-transfer electronics, and spin caloritronics.
  • Recent advancements focus on coherent antiferromagnetic dynamics, introducing spin coherence as a key feature.

Purpose of the Study:

  • To review and analyze critical effects harnessing antiferromagnetic spin coherence for spintronic applications.
  • To explore future research opportunities in coherent antiferromagnetic spintronics.

Main Methods:

  • Categorization and analysis of phenomena related to spin coherence in antiferromagnets.
  • Discussion of principles, materials, and effects driving coherent antiferromagnetic spintronics.

Main Results:

  • Identification of key effects: spin pumping via magnons, spin transmission via phase-correlated magnons, electrically induced spin rotation, and ultrafast spin-orbit effects.
  • Highlighting the role of spin coherence in advancing antiferromagnetic spintronics.

Conclusions:

  • Coherent antiferromagnetic dynamics represent a new frontier in spintronics.
  • Future opportunities lie in exploiting spin coherence for novel device functionalities and applications.