Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 32: Magnetic Thin Films I
MA 32.7: Talk
Wednesday, March 16, 2011, 12:30–12:45, HSZ 04
Nanoengineered iron oxide — •Mehrdad Baghaie Yazdi1, David Bierwagen1, Marie-Laure Goyallon1, Heinz Wanzenböck2, Wolfgang Donner1, and Lambert Alff1 — 1Institute of Materials Science, Technische Universität Darmstadt — 2Institute for Solid State Electronics, Technische Universität Wien
Fe3O4 is clearly an interesting candidate as material for spintronics. Here we show that Fe3O4 can perform as transparent magnetic oxides (TMO) and that Fe nanoclusters can be used to tune the resistivity of magnetite layers. We have successfully grown multilayer thin films of magntite/aluminum doped zinc oxide (ZAO) on glass, by a combination of rf and dc-sputtering, yielding average transmittance in the visible spectrum (400-800 nm) ranging from 40 to above 80% , while maintaining a magnetic moment per area of 0.05 A. Further multilayers of α−Fe and Fe3O4 have been grown in one single step using a kinetically controlled process of reactive rf-sputtering. These films show a decrease in resistivity by one order of magnitude compared to single layer magnetite. The Fe3O4 in both, TMO and the iron-iron oxide composite, shows a sharp Verwey transitions around 120 K, confirming the high quality of the magnetite layers.