Coupling and nonreciprocity as a methods of effective control of spin-wave propagation

Speaker: Prof. Maciej Krawczyk
Affiliation: Institute of Spintronics and Quantum information, Faculty of Physics, Adam Mickiewicz University in Poznań, Poznań, Poland

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Spin waves span a broad range of frequencies from hundreds of MHz up to tens of GHz with the respective wavelengths ranging from micrometers to nanometers. Their spectrum can be tuned by the external fields and also depends on the magnetization configuration. Moreover, the chirality of the spin-wave dynamics and nonreciprocity induced by Dzialoshynski-Moryia interactions can enhance the functionalities demanding by microwave technologies. We show that different types of spin-wave couplings in nanostructures provide an effective way to control spin-wave propagation in planar structures and along the vertical direction promissing for the future 2D and 3D magnonic circuits. In particular, we develope the co-directional and contra-directional couplers between spin waves propagating in different layers with the use of magnonic crystals [1-3]. We propose the spin-wave diode and circulators based on magnetostatic and Dzialoshynski-Moryia induced nonrecirpocity [3], as well as on bulk resonator possesing circulating modes [4]. Just recently, we showed the naoscale billayered resonator to be promissing for sub-wavelength control of the reflected and transmitted phase of spin waves [5] and magnetic skyrmions as a local source of thort shorth-wavelength spin waves [6]. We believe that with these studies we create the physical background for emerging magnonic-spintronic technology.

This study was partially supported from NCN projects SONATA-BIS 2012/07/E/ST3/00538 & SHENG 2018/30/Q/ST3/00416.

References:

[1] P. Graczyk and M. Krawczyk, Phys. Rev. B 96, 024407 (2017), P. Graczyk, et al., Phys. Rev. B 98, 174420 (2018).
[2] P. Graczyk, et al., New J. Phys. 20, 053021 (2018).
[3] P. Roberjot, K. Szulc, et al. (2021), unpublished.
[4] K. Szulc, et al., Phys. Rev. Applied 14, 034063 (2020).
[5] K. Sobucki, et al., Sci Rep 11, 4428 (2021).
[6] M. Zelent, M. Moalic, et al. (2021), unpublished.

Seminar language: English
Chairman: Prof. Ireneusz Weymann