Tunable all-angle negative refraction using antiferromagnets

Macêdo, R. and Dumelow, T. (2014) Tunable all-angle negative refraction using antiferromagnets. Physical Review B, 89(3), 035135. (doi:10.1103/PhysRevB.89.035135)

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We show how all-angle negative refraction can occur in a uniaxial antiferromagnet close to the magnon resonance frequency. This behavior is based on the fact that, in such cases, the antiferromagnet acts as an indefinite permeability medium, i.e., not all its permeability tensor components are of the same sign. If an external magnetic field is applied, the angle of refraction becomes tunable, and can be made to change sign. We illustrate these effects using the example of MnF 2 at low temperature, and show that in this system negative refraction should occur with a large figure of merit.

Item Type:Articles
Additional Information:The work was partially financed by the Brazilian research agency CNPq.
Glasgow Author(s) Enlighten ID:Macedo, Dr Rair
Authors: Macêdo, R., and Dumelow, T.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN (Online):2469-9969
Published Online:22 January 2014
Copyright Holders:Copyright © 2014 American Physical Society
First Published:First published in Physical Review B 89(3): 035135
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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