Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.19: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Growth and magnetic properties of epitaxial Fe3−xZnxO4 thin films — •Deepak Venkateshvaran1, Andrea Boger1, Sebastian T. B. Goennenwein1, Matthias Opel1, M. S. Ramachandra Rao2, and Rudolf Gross1 — 1Walther-Meissner-Institut, BayerischeAkademie der Wissenschaften, 85748 Garching, Germany — 2Materials Science Research Centre, Indian Institute of Technology Madras,Chennai-600036, India
Fe3O4 is an interesting material for spintronic devices due to its high Curie temperature TC ≈ 860 K, and its predicted half metallicity. Doping magnetite with Zn allows to control TC as well as the carrier concentration without losing mobility of the carriers [1]. In this work, we investigated the influence of Zn-doping on the magnetic properties, particulary on saturation magnetization, coercivity and remanence.
We have grown epitaxial Fe3−xZnxO4 thin films with x = 0, 0.1, 0.05 and 0.5 on (001) oriented MgO substrates by pulsed laser deposition. The growth was monitored in situ by reflection high energy electron diffraction (RHEED). The observation of RHEED oscillations proves smooth layer by layer growth. We detected no impurity phases by X-ray diffractometry in combination with a high crystalline quality of the films indicated by a FWHM of the rocking curves of the (004) reflection down to 0.04∘. The magnetic properties were investigated by SQUID magnetometry at temperatures between 5 K and 375 K at fields up to 7 T.
[1] J. Takaobushi et al., Appl. Phys. Lett. 89, 242507 (2006)
This work is supported by DAAD and DFG via priority program 1285.