Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.97: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Gilbert damping in Co2-based Heusler compounds — •Daniel Ebke1, Olga Meshcheriakova1, Albrecht Köhler1, Lukas Wollmann1, Steffen Hausdorf1, Andreas Kehlberger2, Günter Reiss3, Gerhard Fecher1, and Claudia Felser1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Johannes Gutenberg University, Institute of Physics, Mainz, Germany — 3Thin Films and Physics of Nanostructures, Bielefeld University, Germany
To reach a low critical current threshold for spin torque switching devices, materials with a low Gilbert damping constant were in the focus of many research groups in the past years. On the other side, a high Gilbert damping is indispensable to realize short switching times in devices such as read heads for hard disk drives. To realize high TMR or GMR ratios, materials with a high spin polarization P are needed. Layer structures that contain Heusler compounds are excellent candidates due to their extraordinary good tunability of their physical properties to meet all criteria upon request.
In this work we have investigated the influence of atomic ordering and crystal structure to the Gilbert damping constant of Co2-based Heusler compound thin films. The damping constant was determined by FMR measurements as function of post annealing temperature and film thickness.