The comparative study of bulk magneto-phonon and magnetic polaritons of lateral antiferromagnetic superlattices for potential THz applications

Ta, Jin-Xing; Han, Yu; Cheng, Liang

doi:10.1016/j.jmmm.2015.09.080

Cited by 2 publications

(2 citation statements)

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“…Surface magnon-polaritons are directly associated with the permeability tensor of magnetic media. In antiferromagnets, the electromagnetic fields of the incident radiation couple with the spin precession, and the magnetic permeability tensor varies rapidly with frequency close to the fundamental magnetic resonances of the material, usually in the terahertz region [17].…”

Section: Considerations On the Nature Of The Permeability Tensormentioning

confidence: 99%

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Engineering terahertz surface magnon-polaritons in hyperbolic antiferromagnets

Macêdo

Camley

2019

Phys. Rev. B

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Magnetic crystals were recently studied as a route to hyperbolic dispersion and the effects associated with it. These studies, however, concentrated on bulk waves and frequencies where transmission is possible and where negative refraction occurs. Here, in contrast, we concentrate on geometries which sample regions of the dispersion relations where bulk propagation is not possible. This is done by controlling the orientation of the uniaxial anisotropy axis with respect to the surface of the crystal. Furthermore, we find that new magnetic surface polaritons exist in these regions, and we investigate the nature of these waves. In addition, significant tunability can be introduced by applying an external field perpendicular to the easy axes of a uniaxial antiferromagnet, creating a canted structure and generally shifting the frequencies to higher values. This externally applied field dramatically changes the nature of both surface and bulk polaritons, making them highly nonreciprocal.

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Section: Considerations On the Nature Of The Permeability Tensormentioning

confidence: 99%

“…A well-known example of anisotropic materials displaying unusual surface polaritons is that of antiferromagnets [14][15][16][17]. For example, waves propagating on the surface of an antiferromagnetic crystal can be nonreciprocal, where reversal of the wave vector k leads to a new frequency ω, i.e., ω(k) = ω(−k).…”

Section: Introductionmentioning

confidence: 99%