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Title: Nanostructured magnonic crystals with size-tunable bandgaps
Authors: Wang, Z.K. 
Zhang, V.L. 
Lim, H.S. 
Ng, S.C. 
Kuok, M.H. 
Jain, S. 
Adeyeye, A.O. 
Keywords: Brillouin spectroscopy
Dispersion relations
Frequency bandgaps
Magnonic crystals
Size tenability
Issue Date: 23-Feb-2010
Citation: Wang, Z.K., Zhang, V.L., Lim, H.S., Ng, S.C., Kuok, M.H., Jain, S., Adeyeye, A.O. (2010-02-23). Nanostructured magnonic crystals with size-tunable bandgaps. ACS Nano 4 (2) : 643-648. ScholarBank@NUS Repository.
Abstract: Just as a photonic crystal is a periodic composite composed of materials with different dielectric constants, its lesser known magnetic analogue, the magnonic crystal can be considered as a periodic composite comprising different magnetic materials. Magnonic crystals are excellent candidates for the fabrication of nanoscale microwave devices, as the wavelengths of magnons in magnonic crystals are orders of magnitude shorter than those of photons, of the same frequency, in photonic crystals. Using advanced electron beam lithographic techniques, we have fabricated a series of novel bicomponent magnonic crystals which exhibit welldefined frequency bandgaps. They are in the form of laterally patterned periodic arrays of alternating cobalt and permalloy stripes of various widths ranging from 150 to 500 nm. Investigations by Brillouin light scattering and computer modeling show that the dispersion spectrum of these crystals is strongly dependent on their structural dimensions. For instance, their first frequency bandgap is found to vary over a wide range of 1.4-2.6 gigahertz. Such a functionality permits the tailoring of the bandgap structure which controls the transmission of informationcarrying spin waves in devices based on these crystals. Additionally, it is observed that the bandgap width decreases with increasing permalloy stripe width, but increases with increasing cobalt stripe width, and that the bandgap center frequency is more dependent on the stripe width of permalloy than that of cobalt. This information would be of value in the design of magnonic crystals for potential applications in the emerging field of magnonics. © 2010 American Chemical Society.
Source Title: ACS Nano
ISSN: 19360851
DOI: 10.1021/nn901171u
Appears in Collections:Staff Publications

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