Dynamics of antiferromagnetic skyrmion in absence and presence of pinning defect

Abstract

A theoretical study on the dynamics of an antiferromagnetic (AFM) skyrmion is indispensable for revealing the underlying physics and understanding the numerical and experimental observations. In this work, we present a reliable theoretical treatment of the spin current induced motion of an AFM skyrmion in the absence and presence of pinning defect. For an ideal AFM system free of defect, the skyrmion motion velocity as a function of the intrinsic parameters can be derived, based on the concept that the skyrmion profile agrees well with the 360 domain wall formula, leading to an explicit description of the skyrmion dynamics. However, for an AFM lattice containing a defect, the skyrmion can be pinned and the depinning field as a function of damping constant and pinning strength can be described by the Thiele approach. It is revealed that the depinning behavior can be remarkably influenced by the time dependent oscillation of the skyrmion trajectory. The present theory provides a comprehensive scenario for manipulating the dynamics of AFM skyrmion, informative for future spintronic applications based on antiferromagnets.

17 pages, 4 figures, to be published in Physical Review B

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• Magnon driven skyrmion dynamics in antiferromagnets: The effect of magnon polarization
• Optical-controlled ultrafast dynamics of skyrmion in antiferromagnets
• Dynamics of hybrid magnetic skyrmion driven by spin-orbit torque in ferrimagnets
• Controllable magnon frequency comb in synthetic ferrimagnets
• Magnon-driven dynamics of frustrated skyrmion in synthetic antiferromagnets: Effect of skyrmion precession
• Antiferro skyrmion crystal phases in a synthetic bilayer antiferromagnet under an in-plane magnetic field