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Open Access Nano Express

Magnonic band structure investigation of one-dimensional bi-component magnonic crystal waveguides

Fu Sheng Ma, Hock Siah Lim*, Vanessa Li Zhang, Ser Choon Ng and Meng Hau Kuok

Author affiliations

Department of Physics, National University of Singapore, Singapore, 117542, Singapore

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Citation and License

Nanoscale Research Letters 2012, 7:498  doi:10.1186/1556-276X-7-498

Published: 4 September 2012

Abstract

The magnonic band structures for exchange spin waves propagating in one-dimensional magnonic crystal waveguides of different material combinations are investigated using micromagnetic simulations. The waveguides are periodic arrays of alternating nanostripes of different ferromagnetic materials. Our results show that the widths and center frequencies of the bandgaps are controllable by the component materials, the stripe widths, and the orientation of the applied magnetic field. One salient feature of the bandgap frequency plot against stripe width is that there are n-1 zero-width gaps for the nth bandgap for both transversely and longitudinally magnetized waveguides. Additionally, the largest bandgap widths are primarily dependent on the exchange constant contrast between the component materials of the nanostructured waveguides.

Keywords:
Magnonic crystal; Magnonics; Spin wave; Bandgap; Micromagnetic simulations; 75.40.Gb; 75.30.Ds; 75.78.Cd; 75.78.-n