Magnonic Metamaterials for Spin-Wave Control with Inhomogeneous Dzyaloshinskii–Moriya Interactions

Fengjun Zhuo (1, 2) , Hang Li (2) , Zhenxiang Cheng (3) , Aurélien Manchon (4)

1 KAUST - King Abdullah University of Science and Technology [Saudi Arabia]
2 Henan University
3 University of Wollongong [Australia]
4 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille

A magnonic metamaterial in the presence of spatially modulated Dzyaloshinskii–Moriya interaction is theoretically proposed and demonstrated by micromagnetic simulations. By analogy to the fields of photonics, we first establish magnonic Snell’s law for spin waves passing through an interface between two media with different dispersion relations due to different Dzyaloshinskii–Moriya interactions. Based on magnonic Snell’s law, we find that spin waves can experience total internal reflection. The critical angle of total internal reflection is strongly dependent on the sign and strength of Dzyaloshinskii–Moriya interaction. Furthermore, spin-wave beam fiber and spin-wave lens are designed by utilizing the artificial magnonic metamaterials with inhomogeneous Dzyaloshinskii–Moriya interactions. Our findings open up a rich field of spin waves manipulation for prospective applications in magnonics.

Mots clés: Magnonic Metamaterials Spin waves; Dzyaloshinskii-Moriya interaction; Ferromagnetism; Spintronics

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Fengjun Zhuo, Hang Li, Zhenxiang Cheng, Aurélien Manchon. Magnonic Metamaterials for Spin-Wave Control with Inhomogeneous Dzyaloshinskii–Moriya Interactions. Nanomaterials, 2022, 12 (7), pp.1159. ⟨10.3390/nano12071159⟩. ⟨hal-03830922⟩