Dresden 2014 – scientific programme
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DS: Fachverband Dünne Schichten
DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials
DS 35.6: Poster
Wednesday, April 2, 2014, 17:00–20:00, P1
NIR-VUV Spectroscopic Study of ZnFe2O4, CoFe2O4 and ZnCo2O4 Thin Films — •Vitaly Zviagin1, Peter Richter2, Tammo Böntgen1, Michael Lorenz1, Dietrich R.T. Zahn2, Georgeta Salvan2, Rüdiger Schmidt-Grund1, and Marius Grundmann1 — 1Universtät Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, Germany — 2Technische Universtät Chemnitz, Semiconductor Physics, Reichenheinerstr. 70, Germany
We present optical and structural properties of ZnFe2O4, CoFe2O4, and ZnCo2O4 spinel oxides grown at different temperatures on MgO substrates by pulsed laser deposition.
The optical properties were determined by spectroscopic ellipsometry in the range from 0.5 eV to 9.0 eV, and at temperatures from 10 K to 300 K. A model, consisting of Gauss and critical point functions located at the optical transition energies was developed to describe the measured dielectric function. The magneto-optical response of the dielectric tensor was measured by magneto-optical Kerr effect spectroscopy at room temperature.
The crystal structure of the films was determined from wide-angle X-ray diffraction.
It was found that the temperature during the deposition induces a distinct shift in the observed transition
energies as well as a change in the structural properties and surface topology of the thin films.