Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 23: Magnetization / Demagnetization Dynamics II
MA 23.4: Talk
Wednesday, March 28, 2012, 10:30–10:45, H 1012
Micromagnetic study of magnonic band gaps in waveguides with a periodic variation of the saturation magnetization — •Florin Ciubotaru, Andrii V. Chumak, Björn Obry, Alexander A. Serga, and Burkard Hillebrands — FB Physikand Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany
Spin wave propagation in micro-sized magnonic crystals (MCs) is intensively studied due to their potential technological application for signal processing in spintronic devices. Here we report on micromagnetic simulations [1] of the spin wave propagation in a MC realized as a permalloy waveguide with a periodical variation of its saturation magnetization. In real structures the variation of magnetization can be achieved by using an ion implantation technique. The 2 µm-wide waveguide of 40 nm thickness is magnetized transversal to its long axis. The MC lattice constant is equal to 1 µm. The spin-wave transmission characteristics have been studied as a function of the width of the implanted areas and of the level of the magnetization variation M/M0. Frequency band gaps were clearly observed. The dependences of the depth, width and the position in frequency and space of the rejection band gaps on the above parameters are referred in our studies. The role of the higher order spin-wave width modes on the MC properties is discussed as well. Support from DFG (grant SE-1771/1-2) is gratefully acknowledged. [1] OOMMF open code, M. J. Donahue, and D. G. Porter, Report NISTIR 6376, NIST, Gaithersburg, MD (1999).