Title |
Phononic and magnonic dispersions of surface waves on a permalloy/BARC nanostructured array
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Published in |
Discover Nano, March 2013
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DOI | 10.1186/1556-276x-8-115 |
Pubmed ID | |
Authors |
Huihui Pan, Vanessa Li Zhang, Kai Di, Meng Hau Kuok, Hock Siah Lim, Ser Choon Ng, Navab Singh, Adekunle Olusola Adeyeye |
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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