Analysis of optical and magnetooptical spectra of Fe{sub 5}Si{sub 3} and Fe{sub 3}Si magnetic silicides using spectral magnetoellipsometry

• Published in: Journal of experimental and theoretical physics Vol. 120; no. 5
• Main Authors: Lyashchenko, S. A., Popov, Z. I., Varnakov, S. N., Popov, E. A., Molokeev, M. S., Yakovlev, I. A., Kuzubov, A. A., Ovchinnikov, S. G., Shamirzaev, T. S., Latyshev, A. V., Saranin, A. A.
• Format: Journal Article
• Language: English
• Published: United States 15.05.2015
• Subjects: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRONIC STRUCTURE; ELLIPSOMETRY; EPITAXY; EV RANGE; IRON SILICIDES; MAGNETIC CIRCULAR DICHROISM; MAGNETIC PROPERTIES; MAGNETO-OPTICAL EFFECTS; POLYCRYSTALS; REFRACTIVE INDEX; SILICON; SILICON OXIDES; SPIN ORIENTATION
• ISSN: 1063-7761; 1090-6509
• DOI: 10.1134/S1063776115050155

The optical, magnetooptical, and magnetic properties of polycrystalline (Fe{sub 5}Si{sub 3}/SiO{sub 2}/Si(100)) and epitaxial Fe{sub 3}Si/Si(111) films are investigated by spectral magnetoellipsometry. The dispersion of the complex refractive index of Fe{sub 5}Si{sub 3} is measured using multiangle spectral ellipsometry in the range of 250–1000 nm. The dispersion of complex Voigt magnetooptical parameters Q is determined for Fe{sub 5}Si{sub 3} and Fe{sub 3}Si in the range of 1.6–4.9 eV. The spectral dependence of magnetic circular dichroism for both silicides has revealed a series of resonance peaks. The energies of the detected peaks correspond to interband electron transitions for spin-polarized densities of electron states (DOS) calculated from first principles for bulk Fe{sub 5}Si{sub 3} and Fe{sub 3}Si crystals.