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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.19: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

Micromagnetic analysis of spin wave propagation in nanostructured magnonic crystals — •Florin Ciubotaru, Andrii V. Chumak, Alexander A. Serga, Philipp Pirro, and Burkard Hillebrands — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

Spin wave propagation in nanostructured magnonic crystals (MCs) start to be intensively studied due to its potential technological application for signal processing in spintronic devices. Here we report on micromagnetic simulations [1] of the spin wave transmission in nanosized MCs. Two kinds of Permalloy waveguides with periodically varying width were under consideration: sinusoidal and rectangular profiles [2] of the notches. The band gaps (frequency regions where spin waves are not allowed to propagate) have been clearly observed and studied in the space and frequency domain. It is shown that both the band gap frequency and its depth depend strongly on the probing position inside the MC. It is due to the geometrically induced modulation of the internal magnetization field. Furthermore, the MC transmission characteristics can be changed from multiple rejection bands state to a single-band-state by using the harmonically modulated structure. Support from DFG (grant SE 1771/1) is gratefully acknowledged.

[1] OOMMF open code, M. J. Donahue, and D. G. Porter, Report NISTIR 6376, NIST, Gaithersburg, MD (1999). [2] A.V. Chumak et al. Appl. Phys. Lett. 95, 262508 (2009).