Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.42: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Reflectionless magnonic crystal — •Pascal Frey1, Aleksei Nikitin2, Qi Wang1, Florin Ciubotaru3, Sergey A. Bunyaev4, Gleb N. Kakazei4, Boris A. Kalinikos2, Andrii V. Chumak1, Aleksandr A. Serha1, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Kaiserslautern, Germany — 2Department of Physical Electronics and Technology, St. Petersburg Electrotechnical University St. Petersburg, Russia — 3Imec, Leuven, Belgium — 4IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia, Universidade do Porto, Porto, Portugal
The interest in artificial magnetic media like magnonic crystals visibly increased during the recent years in view of their application for information processing at microwave frequencies. The main features of these crystals are the presence of bandgaps in the spin wave spectra. The bandgaps are formed due to the Bragg reflections from the artificially created periodic structures. We studied spin wave propagation in longitudinally magnetized width-modulated yttrium iron garnet waveguides by means of both Brillouin light scattering and microwave techniques in the cw and pulsed regime. 30 ns pulses of backward volume magnetostatic spin waves were excited close to the ferromagnetic resonance frequency and their propagation was visualized and measured, both in pass and rejection frequency bands. No pronounced Bragg reflection was observed. The effect is discussed in comparison with results of micromagnetic simulations. Financial support by the DFG (B01 and DE 639) as well as by DAAD grant 57213643 is gratefully acknowledged.