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Calculations of skyrmions in antiferromagnets (AFMs) are presented, and theirproperties compared with skyrmions in corresponding ferromagnets (FMs). Therates of skyrmion collapse and escape through the boundary of a track, as wellas the binding to and collapse at a non-magnetic impurity, are calculated as afunction of applied magnetic field. The activation energy for skyrmionannihilation is the same in AFMs and corresponding FMs in the absence of anapplied magnetic field. The pre-exponential factor in the Arrhenius rate lawis, however, different because skyrmion dynamics is different in the twosystems. An applied magnetic field has opposite effects on skyrmions in the twotypes of materials. In AFMs the rate of collapse of skyrmions as well as therate of escape through the edge of a magnetic strip decreases slightly withincreasing field, while these rates increase strongly for a skyrmion in thecorresponding FMs when the field is directed antiparallel to the magnetizationin the center of the skyrmion. A non-magnetic impurity is less likely to trap askyrmion in AFMs especially in the presence of a magnetic field. This, togetherwith the established fact that a spin polarized current moves skyrmions in AFMsin the direction of the current, while in FMs skyrmions move at an angle to thecurrent, demonstrates that skyrmions in AFMs have several advantageousproperties over skyrmions in FMs for memory and spintronic devices.

Skyrmions in antiferromagnets: thermal stability and the effect of external field and impurities