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Collinear antiferromagnets enable magnon-mediated coupling in ferromagnet/antiferromagnet/ferromagnet trilayers. This coupling exhibits temperature-dependent antiferromagnetic to ferromagnetic transitions, offering tunable spintronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Materials Science

Background:

  • Collinear antiferromagnets exhibit degenerate magnon excitations with opposite spin polarizations.
  • Magnons can mimic electron behavior in spin-related phenomena.
  • Understanding interlayer coupling is crucial for spintronic device development.

Purpose of the Study:

  • To investigate magnon-mediated interlayer coupling in ferromagnet/antiferromagnet/ferromagnet trilayers.
  • To explore the influence of magnon thermal energy on coupling.
  • To analyze the temperature and thickness dependence of the coupling.

Main Methods:

  • Theoretical calculation of magnon thermal energy within the antiferromagnet layer.
  • Analysis of coupling as a function of ferromagnetic layer orientations.
  • Investigating temperature and antiferromagnetic layer thickness effects.

Main Results:

  • Magnon-mediated interlayer coupling manifests as exchange interaction and perpendicular magnetic anisotropy.
  • The exchange interaction exhibits a temperature-dependent switch from antiferromagnetic at low temperatures to ferromagnetic at high temperatures.
  • Coupling magnitudes can reach 10-100 μeV for nanoscale separations.

Conclusions:

  • Magnon-mediated coupling in F/AF/F trilayers is tunable via temperature and AF thickness.
  • The observed temperature-driven magnetic phase transition offers potential for novel spintronic functionalities.
  • The predicted effects are within the range for experimental verification.