Skyrmionium metamatter: A topologically heterogeneous magnetic crystal with emergent hybrid dynamics

This work introduces a paradigm of magnetic meta-matter in which topological chiral solitons---such as skyrmions and skyrmioniums---serve as distinct ``atomic'' species. In this framework, matter is defined not by chemical elements but by emergent, topologically protected building blocks. By arranging these solitonic units into ordered compound lattices, the resulting meta-matter can be engineered to exhibit well-defined stoichiometries, symmetry classes, and polymorphs, directly mirroring the principles of conventional materials design. Structural transformations between polymorphs enable reconfigurability at the quasiparticle level, establishing solitonic crystals as a fundamentally new form of designed matter with programmable collective behavior and broad potential for next-generation magnonic and spintronic technologies.