Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.3: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Determination of the Exchange Stiffness Constant in Ultrathin Magnetic Films by Ferromagnetic Resonance — •Manuel Langer1,2, Kai Wagner1, Thomas Sebastian1, Helmut Schultheiss1, Kilian Lenz1, Jürgen Lindner1, and Jürgen Fassbender1,2 — 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden — 2Technical University Dresden, 01069 Dresden
In ultrathin magnetic films of 10 — 20 nm thickness, it is hardly possible to determine the exchange constant A using conventional techniques, such as Brillouin light scattering. In this work, a method is presented allowing for analytical determination of the exchange constant A in ultrathin magnetic films.
Periodical surface modulations are introduced by electron beam lithography with subsequent sub-nanometer etching. The periodical stray field induces two-magnon scattering leading to a coupling of the uniform excitation with higher in-plane spin waves.
An analytical model is presented, that can be used to precisely calculate the exchange constant A under usage of the measured ferromagnetic resonance spectra (frequency versus field dependence).
This work is supported by DFG grant LE2443/5-1.