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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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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: One-Bond Coupling01:17

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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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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.
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Controlling spin current polarization through non-collinear antiferromagnetism.

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Researchers controlled spin polarization using a non-collinear antiferromagnet, enabling efficient spintronics. This breakthrough in antiferromagnetic spintronics allows for unconventional spin-orbit torques, crucial for advanced electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin-Hall effect enables charge-spin current interconversion, vital for spintronics.
  • Achieving collinear spin polarization with magnetization is key for energy-efficient switching.
  • Symmetry typically enforces orthogonal spin polarization, limiting applications.

Purpose of the Study:

  • To demonstrate control over spin polarization direction.
  • To explore the use of non-collinear antiferromagnets for novel spintronic functionalities.
  • To enable high-efficiency antiferromagnetic spintronics.

Main Methods:

  • Utilized a non-collinear antiferromagnet, Mn3GaN, with a triangular spin structure.
  • Fabricated epitaxial Mn3GaN/permalloy heterostructures.
  • Investigated spin-orbit torques at room temperature.

Main Results:

  • Achieved control of spin polarization direction by reducing magnetic symmetry.
  • Observed unconventional out-of-plane and Dresselhaus-like spin polarizations.
  • Demonstrated spin-orbit torques forbidden in systems with two-fold rotational symmetry.

Conclusions:

  • Spin-structure design offers a method for controlling spin-orbit torque.
  • Non-collinear antiferromagnets like Mn3GaN are promising for advanced spintronics.
  • This work paves the way for high-efficiency antiferromagnetic spintronic devices.