Degenerate skyrmionic states in synthetic antiferromagnets.

Topological magnetic textures, characterized by integer topological charge, are potential candidates in future magnetic logic and memory devices, due to their smaller size and expected low threshold current density for their motion. An essential requirement to stabilize them is the Dzyaloshinskii-Moriya interaction (DMI) which promotes a particular chirality, leading to a unique value ofin a given material. However, recently coexistence of skyrmions and antiskyrmions, with opposite topological charge, in frustrated ferromagnets has been predicted using--classical Heisenberg model, which opens new perspectives, to use the topological charge as an additional degree of freedom.