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Proceedings Paper

Infrared reflectivity calculations for rare-earth metals
Author(s): K. Abraha
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Paper Abstract

The development of high resolution Fourier transform infrared spectrometers capable of making measurements in highmagnetic fields and over an extended temperature range( ) opens up the possibility of studies of a wide range of magneticmaterials. The far-infrared reflectivity depends on both the dielectric permittivity and the magnetic permeability, the lattercontaining information about the magnetic excitations. The permeability, which normally takes a gyromagnetic form, haspoles at magnetic resonance frequencies. In order for these to be accessible to far infrared instruments it is necessary forthe exchange coupling to enter the restoring force, otherwise the frequency is too low. Thus simple ferromagnets areexcluded but any system with some form of antiferromagnetic coupling is a potential candidate for far infrared studies.Recent work(1) on the simple uniaxial antiferromagnet FeF2 shows very sharp resonance lines which can be followed overa range of temperatures and magnetic fields.

Paper Details

Date Published: 30 November 2017
PDF: 2 pages
Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 21048X (30 November 2017); doi: 10.1117/12.2298753
Show Author Affiliations
K. Abraha, Univ. of Essex (United Kingdom)

Published in SPIE Proceedings Vol. 2104:
18th International Conference on Infrared and Millimeter Waves
James R. Birch; Terence J. Parker, Editor(s)

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