title: Nanostructured magnonic crystal with magnetic-field tunable bandgap.
abstract: Most experimental investigations into magnonic bandgaps are based on structures composed of single-constituent magnetic materials. Here we report Brillouin and numerical studies of the spin dynamics of a bi-component magnonic crystal, viz. a one-dimensional periodic array of alternating permalloy and cobalt 150 nm-wide nanostripes. Our measurements, together with those for a similar crystal composed of 250 nm-wide nanostripes, suggest that for a stripe width ratio of 1:1, the bandgap width of such magnonic arrays increases with crystal lattice constant. The bandgap parameters are strongly dependent on external magnetic field. This magnetic-field tunability of the bandgap is expected to be a crucial property of devices based on magnonic crystals. The agreement between numerical calculations, based on finite element analysis, and the experimental data is generally good.
authors: Department of Physics, National University of Singapore, 117542, Singapore.
authors: V L
authors: VL
authors: Zhang
authors: Z K
authors: ZK
authors: Wang
authors: H S
authors: HS
authors: Lim
authors: S C
authors: SC
authors: Ng
authors: M H
authors: MH
authors: Kuok
authors: S
authors: S
authors: Jain
authors: A O
authors: AO
authors: Adeyeye
mesh_terms: D003460:Crystallization / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008280:Magnetics / Q000295:instrumentation*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation*; D010316:Particle Size