Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Magnetic Heusler Compounds I
MA 35.3: Vortrag
Mittwoch, 28. März 2012, 15:45–16:00, H 0112
Optical properties of Co2FeZ half-metallic Heusler compounds — •Jaroslav Hamrle1, Dominik Legut1, Kamil Postava1, Jaromír Pištora1, Enrique Vilanova2, Mirko Emmel2, and Gerhard Jakob2 — 1Department of Physics and Nanotechnology Centre, VSB - Technical University of Ostrava, Czech Republic — 2Institute of Physics, Mainz University, Germany
Common materials for plasmonic applications are gold and silver, as they provide low damping and negative value of real part of the permittivity. Nowadays, there is a need of new materials, which can provide both plasmonic excitations and magneto-optical activity. Co2-based half metallic Heusler compounds are promising materials for this purpose, as there are several similarities in electronic band structure for exited states between gold, silver and the majority band of Co2-based Heusler compounds for photon energies smaller than minority electron gap size (i.e. below 1 eV).
Within this contribution we present complex refractivity index, determined in range from mid-infrared (mid-IR) to near-ultraviolet, of half-metallic Heusler compounds Co2FeSi, Co2FeAl0.4Si0.6 and Co2FeGa0.5Ge0.5 measured by ellipsometry and IR reflectometry. The optical spectra were computed in the single electron picture within the framework of the DFT. The interband as well as intraband transitions were considered.