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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...
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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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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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Electrical Spin State Manipulation in All-Magnet Heterojunctions Using a Ferromagnetic Spin Source.

Hang Xie1, Zhiqiang Mu2, Yuxin Si1

  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117583, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|December 16, 2024
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Summary

Researchers demonstrated electrical manipulation of spin states in Mn3Sn using ferromagnets as spin sources. This study offers insights into spin-current generation for energy-efficient spintronic devices.

Keywords:
anomalous hall effectcurrent‐induced switchingferromagnetsnoncollinear antiferromagnetsspin current

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Electrical manipulation of spin states is key for energy-efficient spintronic devices.
  • Current methods typically use a spin source and magnetic target, altering the target with charge current.
  • Ferromagnets are theoretically versatile spin sources, but experimental validation is limited.

Purpose of the Study:

  • To experimentally investigate the use of ferromagnets as spin sources for manipulating spin states in non-collinear antiferromagnets.
  • To explore electrical switching in Mn3Sn/ferromagnet bilayers.
  • To understand the underlying mechanisms of spin-current generation and conversion.

Main Methods:

  • Fabrication of Mn3Sn/ferromagnet (Ni, Fe, NiFe, CoFeB) bilayers.
  • Electrical characterization of spin-state manipulation.
  • Analysis of switching behavior with and without assistive magnetic fields.
  • Correlation of switching polarity with the anomalous Hall effect of ferromagnets.

Main Results:

  • Achieved both field-free and field-assisted electrical switching of spin states in Mn3Sn.
  • Demonstrated that switching polarity is linked to the anomalous Hall effect sign of the ferromagnets.
  • Observed spin currents generated by spin-dependent scattering within the ferromagnets.

Conclusions:

  • Ferromagnets can effectively serve as spin sources for manipulating antiferromagnetic spin states.
  • The findings provide insights into spin-conversion mechanisms in ferromagnets.
  • This work presents an alternative spin source for developing novel spintronic applications.