We find numerically skyrmionic textures with skyrmion number Q=0 in ferromagnets with the Dzyaloshinskii-Moriya interaction and perpendicular anisotropy. These have the form of a skyrmion-antiskyrmion pair and may be called chiral droplets. They are stable in an infinite film as well as in disc-shaped magnetic elements. Droplets are found for values of the parameters close to the transition from the ferromagnetic to the spiral phase. We study their motion under spin-transfer torque. They move in the direction of the spin flow and, thus, their dynamics are drastically different than the Hall dynamics of the standard Q=0 skyrmion.
@article{arxiv.2009.00890,
title = {Skyrmion-antiskyrmion droplets in a chiral ferromagnet},
author = {Naveen Sisodia and Pranaba Kishor Muduli and Nikos Papanicolaou and Stavros Komineas},
journal= {arXiv preprint arXiv:2009.00890},
year = {2021}
}