Tunable hyperbolic media: magnon-polaritons in canted antiferromagnets

Macêdo, R. (2017) Tunable hyperbolic media: magnon-polaritons in canted antiferromagnets. In: Camley, R. E. and Stamps, R. L. (eds.) Solid State Physics. Elsevier, pp. 91-155. ISBN 9780128119914 (doi:10.1016/bs.ssp.2017.10.001)

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Unusual reflection and propagation properties of electromagnetic waves in magnetic media have been in the spotlight for many decades. Much attention has been paid to the case of light propagating in antiferromagnetic crystals, due to the unusual behavior of their dynamic permeability tensor—which strongly affects light propagation in magnetic media. Most works have concentrated on abnormalities of the reflected beam at the surface of an antiferromagnet, typically restricted to Voigt's geometry. In this case, both spin alignment direction and external magnetic field lie parallel to the plane of incidence. However, it has recently been shown that a different geometry may display a series of exciting new physical phenomena. In this work, we concentrate on the case where the magnetic field lies perpendicular to both spin alignment direction and plane of incidence, resulting in spin canting. The effects on magnon-polariton resonances and field driven spin canting can be surprising, as for example, tunable Goos–Hänchen shifts of the reflected beam. Also, we show examples of how antiferromagnets can be used as hyperbolic media to achieve tunable negative fraction. We will give examples of antiferromagnetic media used as flat lenses in which the position of the focus can be controlled by the extent of the spin canting.

Item Type:Book Sections
Glasgow Author(s) Enlighten ID:Macedo, Dr Rair
Authors: Macêdo, R.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Published Online:14 November 2017

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