Traveling skyrmions in chiral antiferromagnets

Abstract

Skyrmions in antiferromagnetic (AFM) materials with the Dzyaloshinskii-Moriya (DM) interaction are expected to exist for essentially the same reasons as in DM ferromagnets (FM). It is shown that skyrmions in antiferromagnets with the DM interaction can be traveling as solitary waves with velocities up to a maximum value that depends on the DM parameter. Their configuration is found numerically. The energy and the linear momentum of an AFM skyrmion lead to a proper definition of its mass. We give the details of the energy-momentum dispersion of traveling skyrmions and explore their particle-like character based on exact relations. The skyrmion number, known to be linked to the dynamics of topological solitons in FM, is, here, unrelated to the dynamical behavior. As a result, the solitonic behavior of skyrmions in AFM is in stark contrast to the dynamical behavior of their FM counterparts

Additional results included in V2, minor corrections in V3

References in corpus (1)

• Staggered Dynamics in Antiferromagnets by Collective Coordinates

Cited by in corpus (6)

• Fast current-induced skyrmion motion in synthetic antiferromagnets
• Spin-Transfer Torque in Altermagnets with Magnetic Textures
• Boundary conditions for the Néel order parameter in a chiral antiferromagnetic slab
• Magnetic Skyrmions: from lumps to supercompactons
• Interaction and collision of skyrmions in chiral antiferromagnets
• Vortex propagation and phase transitions in a chiral antiferromagnetic nanostripe