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arXiv · 1710.09163

Collective spin waves in arrays of Permalloy nanowires with single-side periodically modulated width

G. Gubbiotti·L. L. Xiong·F. Montoncello·A. O. Adeyeye
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Abstract

We have experimentally and numerically investigated the dispersion of collective spin waves prop-agating through arrays of longitudinally magnetized nanowires with periodically modulated width. Two nanowire arrays with single-side modulation and different periodicity of modulation were studied and compared to the nanowires with homogeneous width. The spin-wave dispersion, meas-ured up to the third Brillouin zone of the reciprocal space, revealed the presence of two dispersive modes for the width-modulated NWs, whose amplitude of magnonic band depends on the modula-tion periodicity, and a set of nondispersive modes at higher frequency. These findings are different from those observed in homogeneous width NWs where only the lowest mode exhibits sizeable dis-persion. The measured spin-wave dispersion has been satisfactorily reproduced by means of dynam-ical matrix method. Results presented in this work are important in view of the possible realization of frequency tunable magnonic device.

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G. Gubbiotti, L. L. Xiong, F. Montoncello, A. O. Adeyeye. 2017-10-25. Collective spin waves in arrays of Permalloy nanowires with single-side periodically modulated width. https://doi.org/10.1063/1.5006294

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