Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.63: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Ferromagnetic resonance of perpendicular magnetic anisotropy MgO/CoFeB based tri-layers — •Yuriy Aleksandrov1,4, Ciaran Fowley1, Kerstin Bernert1,4, Volker Sluka1, Ewa Kowalska1,4, Michael Farle2, Jürgen Lindner1, Berthold Ocker3, Jürgen Fassbender1,4, and Alina M. Deac Deac1 — 1Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden, Germany — 2Universität Duisburg-Essen Fakultät für Physik Experimentalphysik - AG Farle Lotharstr. 1 47057, Duisburg, Germany — 3Singulus Technologies AG, Hanauer Landstrasse 103, 63796 Kahl am Main, Germany — 4Institute for Physics of Solids, TU Dresden, Zellescher Weg 16, 01069 Dresden, Germany
In this report we use the ferromagnetic resonance technique to investigate the magnetic properties of a CoFeB layer sandwiched by Ta and MgO layers. Samples were annealed in N2 environment for 30 minutes at temperatures between 150 and 250°C in steps of 50°C. FMR measurements are performed at room temperature using a microwave cavity. Thin films are also investigated by standard magnetometry measurements in a SQUID/VSM and also by the extraordinary Hall effect to extract the saturation magnetization and effective anisotropy. Through FMR we are able to simultaneously extract the out-of-plane anisotropy, the effective magnetization and the damping co-efficient, as a function of annealing temperature. Our results show that post-annealing systematically shifts the magnetic easy axis from in-plane to out-of-plane direction. As the annealing temperature is increased the effective magnetization also increases.