Phononic and magnonic dispersions of surface waves on a permalloy/BARC nanostructured array

Author:

Pan Huihui,Zhang Vanessa Li,Di Kai,Kuok Meng Hau,Lim Hock Siah,Ng Ser Choon,Singh Navab,Adeyeye Adekunle Olusola

Abstract

Abstract Phononic and magnonic dispersions of a linear array of periodic alternating Ni80Fe20 and bottom anti-reflective coating nanostripes on a Si substrate have been measured using Brillouin light scattering. The observed phononic gaps are considerably larger than those of laterally patterned multi-component crystals previously reported, mainly a consequence of the high elastic and density contrasts between the stripe materials. Additionally, the phonon hybridization bandgap has an unusual origin in the hybridization and avoided crossing of the zone-folded Rayleigh and pseudo-Sezawa waves. The magnonic band structure features near-dispersionless branches, with unusual vortex-like dynamic magnetization profiles, some of which lie below the highly-dispersive fundamental mode branch. Finite element calculations of the phononic and magnonic dispersions of the magphonic crystal accord well with experimental data.

Publisher

Springer Science and Business Media LLC

Subject

Condensed Matter Physics,General Materials Science

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