The Bimeron Clusters in Chiral Antiferromagnets.

Magnetic bimeron is an in-plane topological counterpart of magnetic skyrmion. Despite the topological equivalence, their statics and dynamics could be distinct, making them attractive from the respective of both physics and spintronic applications. In this work, we investigate the antiferromagnetic (AFM) thin film with isotropic Dzyaloshinskii-Moriya interaction (DMI), and introduce AFM bimeron cluster as a new form of topological quasi-particles. Such exotic spin textures are subject to topological protection, and can absorb other bimeron solitons or clusters along translational direction to acquire a wide range of Neel topological number. The formation of these AFM clusters involves rearrangement of topological structures, and gives rise to remarkable topological static and dynamical properties. Moreover, the bimerons demonstrate high current-driven mobility as general AFM quasi-particles. The merits of AFM bimeron cluster reveal a potential path to unify multi-bits data creation, transmission, storage and even topology-based computation within the same material system, and may stimulate innovative spintronic devices enabling new paradigm of data manipulations.