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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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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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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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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Spin-Canting-Controlled Hole Spin Relaxation in Two-Dimensional Magnet CrSBr.

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  • 1College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, People's Republic of China.

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Controlling spin dynamics in nanoscale spintronics is key. This study reveals how magnetic-field-induced spin orientation in CrSBr influences hole spin relaxation, showing distinct ultrafast depolarization mechanisms.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Technology
  • Materials Science

Background:

  • Controlling spin dynamics is crucial for advancing nanoscale spintronics and quantum technologies.
  • Understanding hole spin relaxation mechanisms is essential for developing new spintronic devices.

Purpose of the Study:

  • To investigate the influence of spin-canting angles on hole spin relaxation in CrSBr.
  • To elucidate the mechanistic transition of spin relaxation governed by magnetic-field-induced spin orientation.

Main Methods:

  • Utilized interlayer spin-canting angles as a proxy for magnetic-field-induced spin reorientation.
  • Employed noncollinear time-dependent density functional theory (TDDFT) combined with nonadiabatic molecular dynamics.

Main Results:

  • Hole energy relaxation rates varied with spin-canting angles (90° > 60° ≈ 0° > 30°), influenced by nonadiabatic coupling.
  • A mechanistic transition in spin relaxation was observed: ultrafast depolarization via adiabatic spin flips at 0°, and nonadiabatic spin flips at finite angles.
  • The 90° configuration exhibited the fastest spin flips due to aligned spin character in valence bands.

Conclusions:

  • Magnetic-field-controlled spin orientation significantly governs ultrafast spin dynamics in magnets.
  • The findings provide insights into manipulating spin relaxation for spintronic applications.