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The discovery of magnetism in two-dimensional (2D) van der Waals (vdW)materials has flourished a new endeavour of fundamental problems in magnetismas well as potential applications in computing, sensing and storagetechnologies. Of particular interest are antiferromagnets, which due to theirintrinsic antiferromagnetic exchange coupling show several advantages inrelation to ferromagnets such as robustness against external magneticperturbations. This property is one of the cornerstones of antiferromagnets andimplies that information stored in antiferromagnetic domains is invisible toapplied magnetic fields preventing it from being erased or manipulated. Here weshow that, despite this fundamental understanding, the magnetic domains ofrecently discovered vdW MnPS3 antiferromagnet can be controlled via externalmagnetic fields and currents. We realize ultrafast domain-wall dynamics withvelocities up to 1500 m/s and 3000 m/s respectively to a broad range of fieldsand current densities. Both domain wall dynamics are determined by the edgeterminations which generated uncompensated spins following the underlyingsymmetry of the honeycomb structure. We find that edge atoms belonging todifferent magnetic sublattices function as geometrical constrictions preventingthe displacement of the wall, whereas having atoms of the same sublattice atboth edges of the material allows for the field-driven domain wall motion whichis only limited by the spin-flop transition of the antiferromagnet beyond 25 T.Conversely, electric currents can induce motion of domain walls in most of theedges except those where the two sublattices are present at the borders (e.g.armchair edges). Our results indicate that the implementation of 2D vdWantiferromagnets in real applications requires the engineering of the layeredges which enables an unprecedented functional feature in ultrathin deviceplatforms.

Ultrafast current and field driven domain-wall dynamics in van der Waals antiferromagnet MnPS3