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Dipolar magnon-magnon coupling has long been predicted in nano-patternedartificial spin systems. However, observation of such phenomena and relatedcollective spin-wave signatures have until recently proved elusive or limitedto low-power edge-modes which are difficult to measure experimentally. Here wedescribe the requisite conditions for dipolar mode-hybridisation, how it may becontrolled, why it was not observed earlier and how strong coupling may occurbetween nanomagnet bulk-modes. We experimentally investigate fournano-patterned artificial spin system geometries: `chevron' arrays, `square',`staircase' and `brickwork' artificial spin ices. We observe significantdynamic dipolar-coupling in all systems with relative coupling strengths andavoided-crossing gaps supported by micromagnetic-simulation results. Wedemonstrate reconfigurable mode-hybridisation regimes in each system viamicrostate control, and in doing so elucidate the underlying dynamics governingdynamic dipolar-coupling with implications across reconfigurable magnonics. Wedemonstrate that confinement of the bulk-modes via edge effects play a criticalrole in dipolar hybridised-modes, and treating nanoislands as a coherentlyprecessing macro-spins or standing spin-waves are insufficient to captureexperimentally-observed coupling phenomena. Finally, we present aparameter-space search detailing how coupling strength may be tuned viananofabrication-dimensions and material properties.

Observation and control of collective spin-wave mode-hybridisation in chevron arrays and square, staircase and brickwork artificial spin ices