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We investigate spin dynamics in nanodisc arrays of synthetic-antiferromagnets(SAF) made of Py/NiCu/Py trilayers, where the NiCu spacer undergoes a Curietransition at about 200 K. The observed ferromagnetic resonance spectra havethree distinct resonance modes at room temperature, which are fully recreatedin our micromagnetic simulations showing also how the intra-SAF asymmetry canbe used to create and control the higher-order resonances in the structure.Below the Curie temperature of the spacer, the system effectively transitionsinto a single-layer nanodisc array with only two resonance modes. Our resultsshow how multi-layering of nano-arrays can add tunable GHz functionalityrelevant for such rapidly developing fields as magnetic meta-materials,magnonic crystals, arrays of spin-torque oscillators and neuromorphicjunctions.

Higher-order ferromagnetic resonances in periodic arrays of synthetic-antiferromagnet nanodiscs