Magnonic frequency combs (MFCs) are emerging as powerful tools for coherent information processing, yet most existing schemes are limited to a single spacing. Here we demonstrate, through micromagnetic simulations, that a skyrmionium hosted in a synthetic antiferromagnet can generate triple MFCs. We found that the skyrmionium supports in-phase, out-of-phase, and other gyrotropic modes, whose nonlinear interactions with propogating spin waves produce three interleaved sets of comb teeth under suitable conditions. We showed that the interlayer antiferromagnetic coupling can modulate the mode frequency, thereby enabling continuous control of the comb spacing. These results establish skyrmionium-based synthetic antiferromagnets as a promising platform for broadband and tunable MFCs, opening avenues for spintronic and quantum magnonic applications.

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• Magnons
• Spintronics
• Antiferromagnets