Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)
MA 13.50: Poster
Dienstag, 24. März 2009, 10:15–13:00, P1A
Magnetic anisotropy of (100)- and (110)-oriented CrO2 thin films — •Franz Czeschka1, Daniel Rueffer1, Sebastian T.B. Goennenwein1, Rudolf Gross1, Arunava Gupta2, Christoph Bihler3, and Martin S. Brandt3 — 1Walther-Meißner-Insitut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2MINT Center, Tuscaloosa, Alabama, USA — 3Walter Schottky Institut, Technische Universität München, Garching, Germany
In the field of spintronics, ferromagnetic materials with a high spin polarization are important. A promising material in this context is the half metal chromium dioxide (CrO2) with a spin polarization of P≈98 % and a Curie temperature of T≈390 K. However, for the application a quantitative knowledge of its magnetic properties is essential.
We have determined the magnetic anisotropy of thin CrO2 films with thicknesses ranging from 10 nm to 1.2 µm at room temperature by ferromagnetic resonance spectroscopy (FMR) both in the X-band (9.3 GHz) and in the K-band (24.125 GHz). The films were grown by chemical vapor deposition (CVD) on either (100)- or (110)-oriented TiO2 single crystal substrates. A clear dependence of the magnetic anisotropy on the crystallographic orientation and on the CrO2 thickness was observed. We discuss the influence of epitaxial strain on the magnetic anisotropy and compare our results to literature.
Financial support of the German Excellence Initiative via the “Nanosystems Initiative Munich (NIM)” is gratefully acknowledged.