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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.44: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P3
Crystallisation of optically thick films of CoxFe(80-x)B20: evolution of the (magneto-) optical and structural properties — •Apoorva Sharma1, Maria A. Hoffmann2, Patrick Matthes3, Olav Hellwig1,4, Cornelia Kowol2, Stefan E. Schulz2,3, Dietrich R. T. Zahn1, and Georgeta Salvan1 — 1Institute of Physics, Chemnitz University of Technology, 09126 Chemnitz, Germany — 2Center for Microtechnologies, Chemnitz University of Technology, 09126 Chemnitz, Germany — 3Fraunhofer Institute for Electronic Nanosystems, 09126 Chemnitz, Germany — 4Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
Co-Fe-B alloys are highly relevant materials for spintronic applications. In this work, the crystallisation of Co-Fe-B alloys triggered by thermal annealing was investigated by X-ray diffraction techniques and SEM, as well as spectroscopic ellipsometry and magneto-optical Kerr effect spectroscopy for annealing temperatures ranging from 300°C to 600°C. The transformation of ~100 nm thick CoxFe(80-x)B20 films from amorphous to polycrystalline was revealed by the sharpening of spectral features observed in the optical and magneto-optical dielectric functions spectra. The influence of B on the dielectric function was assessed both experimentally and by optical modelling. By analysing the Drude component of the dielectric function, a consistent trend between the charge carrier scattering time/resistivity and the annealing temperature was observed, in agreement with the electrical investigations by means of the four-point-probe method.