30 November 2017 Infrared reflectivity calculations for rare-earth metals
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Proceedings Volume 2104, 18th International Conference on Infrared and Millimeter Waves; 21048X (2017) https://doi.org/10.1117/12.2298753
Event: 18th International Conference on Infrared and Millimeter Waves, 1993, Colchester, United Kingdom
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.
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K. Abraha, "Infrared reflectivity calculations for rare-earth metals", Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 21048X (30 November 2017); doi: 10.1117/12.2298753; https://doi.org/10.1117/12.2298753
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