Regensburg 2013 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 22: Poster II
DF 22.73: Poster
Freitag, 15. März 2013, 10:30–13:30, Poster D
Structural and magnetic properties of NiFe2O4 thin films prepared by different deposition techniques — •Christoph Klewe1, Timo Kuschel1, Daniel Meier1, Gerhard Götz1, Liming Shen2, Arunava Gupta2, Karsten Küpper3, Jan-Michael Schmalhorst1, and Günter Reiss1 — 1Bielefeld University, Germany — 2University of Alabama, Tuscaloosa, AL, USA — 3University of Osnabrück, Germany
Recent advances in the field of spin caloritronics have urged the search for ferro- or ferrimagnetic, insulating materials in thin film form. One material which promises to be suitable for studies of the longitudinal Spin Seebeck effect is Nickelferrite (NiFe2O4). We fabricated NiFe2O4 thin films on MgAl2O4 (001) substrates by direct liquid injection chemical vapour deposition(DLI-CVD) and dc magnetron co-sputtering in a pure oxygen atmosphere. Stoichiometric measurements were performed using energy dispersive x-ray spectroscopy (EDX), x-ray fluorescence (XRF) and sputter x-ray photoelectron spectroscopy (XPS). Structural properties were investigated by x-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). Magnetic properties were determined from magnetooptic Kerr effect (MOKE) and alternating gradient magnetometry (AGM) measurements. Temperature dependent measurements were carried out in order to investigate the resistivity and determine the bandgap. The results were compared to identify the best deposition technique and parameters with regard to the insulating properties of the ferromagnetic films.