Berlin 2008 – scientific programme
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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 18.17: Poster
Tuesday, February 26, 2008, 15:15–18:30, Poster E
Magnetic anisotropy of (100)− and (110)−oriented CrO2 thin films — •Manuel J. Schwarz1, Sebastian T.B. Goennenwein1, Matthias Opel1, Rudolf Gross1, Arunava Gupta2, Christoph Bihler3, and Martin S. Brandt3 — 1Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2MINT Center, University of Alabama, Tuscaloosa, AL, USA — 3Walter Schottky Institut, Technische Universität München, Garching, Germany
Ferromagnetic materials with high spin polarization P are very attractive for spin electronics. In this context,
chromium dioxide (CrO2) as a well established half-metallic ferromagnet with a spin polarization P ≈ 0.98 and a Curie temperature TC ≈ 390 K well above room temperature is a promising material. Therefore its magnetic properties, in particular the magnetic anisotropy of strained thin film samples, have to be understood in detail.
We have investigated a series of thin CrO2 films with thicknesses ranging from 10 nm to 100 nm grown by chemical vapor deposition (CVD) on either (100)−oriented or (110)−oriented TiO2 single crystal substrates. Using ferromagnetic resonance (FMR) spectroscopy in the X-band (9.3 GHz), we have quantitatively determined the magnetic anisotropy of these samples at room temperature. We find a clear dependence of the magnetic anisotropy on both crystallographic orientation and film thickness. We discuss to which extent this evolution of magnetic anisotropy is linked to epitaxial strain, and compare our results to the literature.