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MA: Fachverband Magnetismus
MA 45: Magnonics I
MA 45.5: Vortrag
Donnerstag, 19. März 2020, 10:30–10:45, HSZ 401
Reflection-less width-modulated magnonic crystals — •Pascal Frey1, Aleksei A. Nikitin2, Alexey B. Ustinov2, Florin Ciubotaru3, Andrii V. Chumak4, Burkard Hillebrands1, and Alexander A. Serga1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Department of Physical Electronics and Technology, St. Petersburg Electrotechnical University, 197376 St. Petersburg, Russia — 3imec, B-3001 Leuven, Belgium — 4Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
Magnonic crystals receive a lot of attention in spintronics, due to their great potential for information processing technologies. The main features of these crystals are the presence of bandgaps in the spin-wave spectra. The bandgaps are formed due to Bragg reflections from the artificially created periodic structures. In this work, we studied spin-wave propagation in longitudinally magnetized width-modulated yttrium-iron-garnet waveguides by means of both Brillouin light scattering and microwave spectroscopies. Short pulses (30 ns) 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. We found, that the width-modulated magnonic crystal, shows a new underlying mechanism, where no back reflection of the spin-wave pulse is observed. Such a reflection-less magnonic crystal is a promising candidate for the realization of frequency selective or multi-component devices.