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Far-Infrared Reflection from Heterostructures Made of Ultrathin Ferromagnetic Layers

Patrick M. Yarbrough1, Karen L. Livesey1,*, Robert E. Camley1, and Rair Macêdo2

  • 1Center for Magnetism and Magnetic Materials, Department of Physics and Energy Science, University of Colorado Colorado Springs, Colorado Springs, Colorado 80918, USA
  • 2James Watt School of Engineering, Electronics & Nanoscale Engineering Division, University of Glasgow, Glasgow G12 8QQ, United Kingdom

  • *klivesey@uccs.edu
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Phys. Rev. Applied 12, 024004 – Published 2 August, 2019

DOI: https://doi.org/10.1103/PhysRevApplied.12.024004

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.

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Phys. Rev. Applied 12, 024004– Published 2 August, 2019
  • Received 11 March 2019
  • Revised 6 May 2019
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