Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.88: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Optical and magneto-optical spectroscopy of Co₂FeGa_0.5Ge_0.5 thin films — •Daniel Kral¹, Radek Jesko², Lukas Beran¹, Roman Antos¹, Martin Veis¹, Dominik Legut², Enrique Vilanova³, Gerhard Jakob³, and Jaroslav Hamrle² — ¹Institute of Physics, Charles University in Prague, Prague, Czech Republic — ²Nanotechnology Centre, VSB-Technical University of Ostrava, Ostrava, Czech Republic — ³Institute of Physics, University of Mainz, Mainz, Germany

Heusler compounds are well known as exceptionally tunable materials. They have received considerable attention due to their high Curie temperature and high spin polarization [1], which makes them good candidates for applications in novel spintronic devices.

In this work, we present a systematic study of optical and magneto-optical (MO) properties of Co₂FeGa_0.5Ge_0.5 Heusler compounds by means of spectroscopic ellipsometry and Kerr MO spectroscopy. The samples were grown by DC sputtering onto MgO/Al₂O₃ substrates under various conditions. MO Kerr spectroscopy was carried out in polar and longitudinal configurations in the photon energy range from 1.2 to 5 eV. The information about the spectral dependence of complete permittivity tensor of all samples was deduced form ellipsometric and MO measurements. Finally, all experimental data were confronted with ab-initio calculations.

This work was supported by Grant Agency of Czech Republic (grant no. 13-30397S).

[1] S. Wurmehl, et al., Appl. Phys. Lett. 88, 032503 (2006).