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Interlayer Couplings Mediated by Antiferromagnetic Magnons.
Ran Cheng1,2,3, Di Xiao1, Jian-Gang Zhu1,2
1Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Collinear antiferromagnets enable magnon-mediated coupling in ferromagnet/antiferromagnet/ferromagnet trilayers. This coupling exhibits temperature-dependent antiferromagnetic to ferromagnetic transitions, offering tunable spintronic applications.
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.
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