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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.3: Poster

Tuesday, March 17, 2015, 09:30–13:00, Poster A

Determination of the Exchange Stiffness Constant in Ultrathin Magnetic Films by Ferromagnetic Resonance — •Manuel Langer^1,2, Kai Wagner¹, Thomas Sebastian¹, Helmut Schultheiss¹, Kilian Lenz¹, Jürgen Lindner¹, and Jürgen Fassbender^1,2 — 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.