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MA: Fachverband Magnetismus

MA 31: Magnonics I

MA 31.11: Vortrag

Mittwoch, 14. März 2018, 18:00–18:15, H 0110

Directional couplers for short spin wave generation: magnons and phonons — •Piotr Graczyk, Mateusz Zelent, Jarosław Kłos, and Maciej Krawczyk — Faculty of Physics, Adam Mickiewicz University in Poznan, Umultowska 85, 61-614 Poznan, Poland

New ideas to generate short spin waves and process spin wave signals are very desirable nowadays, due to their potential for high energy efficiency and miniaturization. We present here two mechanisms to achieve this goal: directional dipolar coupling in magnonic crystal and broadband magnetoelastic coupling in the magnonic-phononic system. The former is achieved by grating-assisted resonant dipolar interaction between two ferromagnetic layers separated by some distance. We show by the numerical calculations the efficient energy transfer between layers which may be of co-directional or contra-directional type. Such a system may operate either as a short spin wave generator or a frequency filter. In the latter we investigated the dynamics of magnetoelastic excitations in a system consisting of alternating layers of permalloy and CoFeB. The studied structure is optimized for hybridization of specific spin-wave and acoustic dispersion branches in a broad frequency range. Therefore, a device based on this mechanism may be used for efficient generation of high-frequency broadband spin wave signals.

P. Graczyk, M. Zelent, and M. Krawczyk, arXiv:1710.09138 (2017); P. Graczyk and M. Krawczyk, Phys. Rev. B 96, 024407 (2017); P. Graczyk, J. Kłos and M. Krawczyk, Phys. Rev. B 95, 104425 (2017).

Financial support from NCN Poland grants UMO-2012/07/E/ST3/00538, UMO-2016/21/B/ST3/00452