Far-infrared reflection from heterostructures made of ultrathin ferromagnetic layers

Yarbrough, P. M., Livesey, K. L., Camley, R. E. and Macêdo, R. (2019) Far-infrared reflection from heterostructures made of ultrathin ferromagnetic layers. Physical Review Applied, 12(2), 024004. (doi:10.1103/PhysRevApplied.12.024004)

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Abstract

Recent progress has been made in creating terahertz magnons using ultrathin ferromagnetic layers. Due to their short lifetimes, these can be difficult to measure. Here we detail a calculation that shows that infrared magnons can be detected using standard reflection and attenuated total reflection measurements from a thin-film heterostructure made up of alternating ultrathin magnetic and nonmagnetic layers. We use an entire-cell effective-medium calculation to find the magnetic permeability of the heterostructure and then use electromagnetic boundary conditions to calculate reflectivity as a function of frequency. There are appreciable dips in the reflectivity at infrared magnon resonance frequencies, for realistic material parameters. Moreover, the strong coupling of magnon photons indicates the possible use of 50 GHz–1 THz magnons in integrated signal-processing devices.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Macedo, Dr Rair
Authors: Yarbrough, P. M., Livesey, K. L., Camley, R. E., and Macêdo, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Applied
Publisher:American Physical Society
ISSN:2331-7019
ISSN (Online):2331-7019
Published Online:02 August 2019
Copyright Holders:Copyright © 2019 American Physical Society
First Published:First published in Physical Review Applied 12(2):024004
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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