Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.27: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Spin-wave modes and grating coupler effect in bicomponent magnetic periodic lattices of different topology — •Stefan Mändl1, Florian Heimbach1, Haiming Yu1,2, and Dirk Grundler1 — 1Physik Department E10, TU München, Garching, Germany — 2present address: Spintronics Interdisciplinary Center, Beihang University, China
Recently the so called magnonic grating coupler (MGC) effect was observed in bicomponent magnetic lattices consisting of e.g. a two-dimensional (2D) array of Py nanodisks partly embedded in a CoFeB thin film. [Yu13] It was shown that the periodic lattice provoked backfolding of the fundamental mode. We present spin-wave spectroscopy and simulations on bicomponent MGCs where we inverted the materials composition and varied the structural composition (topology) to optimize the backfolding effect. In experiments on 2D arrays of CoFeB nanodisks integrated to a Py film a series of spin-wave resonances were resolved that we attributed to MGC modes radiated in up to 16 different directions. This way a spin-wave nanograting coupler with almost omnidirectional spin-wave emission was created. We provide microscopic insight into the MGC performance by comparing micromagnetic simulations and spectroscopy data. The work was funded by the Cluster of Excellence Nanosystems Initiative Munich and in the SPP 1538 via GR1640/5.
[Yu13] H. Yu, G. Duerr, R. Huber, M. Bahr, T. Schwarze, F. Brandl, D. Grundler, Omnidirectional spin-wave nanograting coupler, Nature Communications 4, 2702 (2013)