Reconfigurable magnonic mode-hybridisation and spectral control in a bicomponent artificial spin ice

Jack C. Gartside (), Alex Vanstone, Troy Dion, Kilian D. Stenning, Daan M. Arroo, Hidekazu Kurebayashi and Will R. Branford
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Jack C. Gartside: Imperial College London
Alex Vanstone: Imperial College London
Troy Dion: Imperial College London
Kilian D. Stenning: Imperial College London
Daan M. Arroo: University College London
Hidekazu Kurebayashi: University College London
Will R. Branford: Imperial College London

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Strongly-interacting nanomagnetic arrays are finding increasing use as model host systems for reconfigurable magnonics. The strong inter-element coupling allows for stark spectral differences across a broad microstate space due to shifts in the dipolar field landscape. While these systems have yielded impressive initial results, developing rapid, scaleable means to access a broad range of spectrally-distinct microstates is an open research problem. We present a scheme whereby square artificial spin ice is modified by widening a ‘staircase’ subset of bars relative to the rest of the array, allowing preparation of any ordered vertex state via simple global-field protocols. Available microstates range from the system ground-state to high-energy ‘monopole’ states, with rich and distinct microstate-specific magnon spectra observed. Microstate-dependent mode-hybridisation and anticrossings are observed at both remanence and in-field with dynamic coupling strength tunable via microstate-selection. Experimental coupling strengths are found up to g/2π = 0.16 GHz. Microstate control allows fine mode-frequency shifting, gap creation and closing, and active mode number selection.

Date: 2021
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DOI: 10.1038/s41467-021-22723-x

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