title: Phononic and magnonic dispersions of surface waves on a permalloy/BARC nanostructured array.
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.
authors: Department of Physics, National University of Singapore, Singapore 117542, Singapore. phykmh@nus.edu.sg.
authors: Huihui
authors: H
authors: Pan
authors: Vanessa Li
authors: VL
authors: Zhang
authors: Kai
authors: K
authors: Di
authors: Meng Hau
authors: MH
authors: Kuok
authors: Hock Siah
authors: HS
authors: Lim
authors: Ser Choon
authors: SC
authors: Ng
authors: Navab
authors: N
authors: Singh
authors: Adekunle Olusola
authors: AO
authors: Adeyeye