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Magnon-polaritons in graphene/gyromagnetic slab heterostructures
M S Vasconcelos1,2, M G Cottam2, D H A L Anselmo1,3
1Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, 59072-970, Natal, RN, Brazil.
Summary
Graphene layers on magnetic materials control surface magnon-polaritons. Varying graphene doping tunes mode velocities and propagation, offering new possibilities for spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Surface magnon-polaritons are hybrid excitations at the interface of magnetic materials and electromagnetic fields.
- Graphene's unique electronic properties offer potential for manipulating such excitations.
- Gyromagnetic materials, including ferromagnetic and antiferromagnetic insulators, support magnon excitations.
Purpose of the Study:
- To theoretically investigate the influence of graphene on surface magnon-polariton modes.
- To explore how varying graphene doping levels affect mode characteristics.
- To analyze the impact of different magnetic materials (ferromagnetic vs. antiferromagnetic) on mode propagation.
Main Methods:
- Theoretical modeling of structures comprising graphene on insulating gyromagnetic media.
- Analysis of surface magnon-polariton dispersion relations and propagation properties.
- Inclusion of varying graphene Fermi energies (doping levels) and magnetic sample geometries (semi-infinite and slab).
Main Results:
- Graphene significantly influences surface magnon-polariton modes.
- Tunable group velocities of the modes are achieved by altering graphene's Fermi energy.
- Modified nonreciprocal and reciprocal propagation characteristics are observed, dependent on the magnetic material type.
- Distinct localization properties of the surface modes are identified.
Conclusions:
- Graphene acts as a powerful tool for controlling surface magnon-polaritons in magnetic heterostructures.
- The findings demonstrate potential for novel spintronic applications utilizing tunable magnonic properties.
- This study opens avenues for designing advanced magnetic devices with tailored wave propagation.
Keywords:
antiferromagnetsferromagnetsgraphenegyromagnetic slabheterostructuresmagnon-polaritonssurface modesMore Related Videos
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