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Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.35: Poster

Friday, April 4, 2014, 10:30–13:30, P2

Ultra low magnetic damping in half metalic CrO2 — •Markus Härtinger1, Tim Mewes2, Arunava Gupta2, Georg Woltersdorf1,3, and Christian Back11Department 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.

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