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Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Spin–Spin Coupling Constant: Overview01:08

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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.
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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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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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

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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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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...
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Spin-Orbit Coupling Driven Magnetic Response in Altermagnetic RuO2.

Jeongkeun Song1,2, Seung Hun Lee1,2,3, San Kang1,2

  • 1Department of Physics and Astronomy, Seoul National University, Seoul, 08826, South Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|November 21, 2024
PubMed
Summary

Researchers explored altermagnetism in rutile ruthenium dioxide (RuO2) films using the Planar Hall Effect (PHE). The study reveals unique magnetic responses, suggesting potential for advanced spintronics.

Keywords:
RuO2altermagnetismoxide thin filmspin‐orbit couplingtransport

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnetism is a newly predicted magnetic phase with potential for novel phenomena and spintronics.
  • Rutile ruthenium dioxide (RuO2) is a promising material candidate for altermagnetism, but experimental studies are nascent.
  • Investigating magnetic responses in RuO2 is crucial for understanding and harnessing altermagnetism.

Purpose of the Study:

  • To experimentally investigate the magnetic responses in rutile RuO2 films.
  • To explore the potential of RuO2 as an altermagnetic material.
  • To establish a method for detecting magnetic phenomena in altermagnetic systems.

Main Methods:

  • Utilized the Planar Hall Effect (PHE) to probe magnetic properties.
  • Applied external magnetic fields (Hext) and rotated them to observe magnetic responses.
  • Analyzed the planar Hall conductivity as a function of the external field.

Main Results:

  • The PHE in RuO2 films exhibited twofold behaviors upon external field rotation.
  • Planar Hall conductivity displayed a nonlinear response to the applied external field.
  • Observed PHE characteristics are analogous to those in ferromagnetic and topologically nontrivial systems.

Conclusions:

  • The findings suggest field-induced magnetic responses in rutile RuO2, consistent with altermagnetic behavior.
  • The study provides a viable strategy for detecting intriguing magnetic responses in altermagnetic materials.
  • This research promotes further exploration of altermagnet-based spintronics and associated novel phenomena.