Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 67: Poster 4
MA 67.6: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG3
The Transition from a Thin Film to a Full Magnonic Crystal and the Role of the Demagnetizing Field — •Manuel Langer1,2, Falk Röder1,2,3, Rodolfo A. Gallardo4, Tobias Schneider1,5, Sven Stienen1, Christophe Gatel3, René Hübner1, Kilian Lenz1, Jürgen Lindner1, Pedro Landeros4, and Jürgen Fassbender1 — 1HZDR, Dresden — 2TU Dresden, Dresden — 3CEMES-CNRS, Toulouse, France — 4USM, Valparaíso, Chile — 5TU Chemnitz, Chemnitz
The transition from a film to a full magnonic crystal is studied by sequentially ion-milling a 40 nm Ni80Fe20 film. The spin-wave resonances of each stage are detected by ferromagnetic resonance for both in-plain field main axes. Theoretical calculations and micromagnetic simulations yield the individual mode profiles, which are analyzed in order to track changes of the mode character. The latter is strongly linked to the evolution of the internal demagnetizing field. It’s role is further studied by electron holography measurements of a hybrid magnonic crystal with 10 nm deep surface modulation. The complex effects of mode coupling, mode localization and anisotropy-like contributions by the internal field are unraveled. Simple transition rules from the nth film mode to the mth mode of the full magnonic crystal are formulated.