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Nanoscale Res Lett. 2013 Mar 2;8(1):115. doi: 10.1186/1556-276X-8-115.

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

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1
Department of Physics, National University of Singapore, Singapore 117542, Singapore. phykmh@nus.edu.sg.

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.

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