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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.35: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Ultra low magnetic damping in half metalic CrO₂ — •Markus Härtinger¹, Tim Mewes², Arunava Gupta², Georg Woltersdorf^1,3, and Christian Back¹ — ¹Department of Physics, Universität Regensburg, 93040 Regensburg, Germany — ²University of Alabama, Tuscaloosa, U.S.A. — ³Department of Physics, Martin-Luther-Universität Halle, 06099 Halle(Saale), Germany

Chromiumdioxide (CrO₂) is one of the most interesting half-metallic ferromagnets with a large spin polarization and a high Curie temperature. It was studied for a long time and used for various magnetic storage devices. Since few years it is possible to grow high quality single crystalline CrO₂ films by chemical vapour deposition (CVD).

We report on the magnetic properties and anisotropies of a 29 nm thick CrO₂ (100) layer grown on a TiO₂ (001) substrate. The magnetic properties are determined by performing ferromagnetic resonance (FMR) measurements in a large frequency range covering 2 to 40 GHz. We find extremely narrow resonance lines corresponding to a very small Gilbert damping constant of approximately α ≈ 0.0002−0.0004. Our angular dependent measurements also show that two magnon scattering dominates the relaxation when the magnetization lies in the sample plane.