Berlin 2012 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 13: Poster II
DF 13.12: Poster
Mittwoch, 28. März 2012, 15:00–17:30, Poster E
Raman spectroscopic investigations of CoFe2O4 and NiFe2O4 epitaxial sub-micron structures — •Cameliu Himcinschi1, Ionela Vrejoiu2, and Andreas Talkenberger1 — 1TU Bergakademie Freiberg, Institute of Theoretical Physics, D-09596 Freiberg — 2Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle
CoFe2O4(CFO) and NiFe2O4(NFO) are insulating ferrimagnetic spinel oxides that are attractive for application in magneto-electric oxide heterostrucuture devices. CFO and NFO epitaxial thin films were grown on Nb-doped SrTiO3(100) substrates by pulsed-laser deposition. For the fabrication of ordered arrays of sub-micron structured CFO and NFO a SiN stencil mask was used. In this work we present an investigation of the CFO and NFO thin films and structures by Raman spectroscopy. The Raman spectra of CFO and NFO thin films indicate the formation of a spinel structure with symmetry lower than the cubic inverse spinel one. The assignment of the Raman modes was done by employing different polarization scattering configurations. Similar spectra were measured also for the structured arrays suggesting the preservation of the structure observed in the epitaxial thin films. The degree of disorder in the cation distribution in the octahedral sites is discussed based on the broadening of the Raman peaks.
This work is supported by the German Research Foundation DFG HI 1534/1-1.