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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.1: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Annealing influence on the spin-dynamic properties of CoFeB thin films — •Tobias Fischer1, Thomas Meyer1, Thomas Brächer1, Björn Heinz1, Andrés Conca1, Evangelos Papaioannou1, Stefan Klingler1, Jochen Greser1, Thomas Sebastian1,2, Britta Leven1, Jörg Lösch3, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Current affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden — 3Institut für Oberflächen- und Schichtanalytik GmbH (IFOS) and Landesforschungszentrum OPTIMAS, Trippstadter Str. 120, 67663 Kaiserslautern, Germany
Materials and material systems with ultra-low Gilbert damping para- meters are a crucial requirement for the realization of spin-wave logic devices. For that, CoFeB is a promising candidate due to its intrinsically low damping. Our aim is to investigate the suitability of an annealing step to further decrease the damping in CoFeB-based systems. Ferromagnetic resonance measurements as well as the magneto-optical Kerr effect reveal the dependence of the Gilbert damping parameter, the exchange constant, the saturation magnetization, and the coercive field on the annealing temperature. The correlation of these parameters with the crystalline properties is determined using X-ray diffracto- metry. Furthermore, we present Brillouin light scattering spectroscopy measurements of spin waves in waveguides showing the influence of annealing on the spin-dynamic properties.