We study the nucleation and collective dynamics of Shankar skyrmions [R. Shankar, Journal de Physique 38, 1405 (1977)] in the class of frustrated magnetic systems described by an SO(3) order parameter, including multi-lattice antiferromagnets and amorphous magnets. We infer the expression for the spin-transfer torque that injects skyrmion charge into the system and the Onsager-reciprocal pumping force that enables its detection by electrical means. The thermally-assisted flow of topological charge gives rise to an algebraically decaying drag signal in nonlocal transport measurements. We contrast our findings to analogous effects mediated by spin supercurrents.
@article{arxiv.1901.01208,
title = {Hydrodynamics of three-dimensional skyrmions in frustrated magnets},
author = {Ricardo Zarzuela and Héctor Ochoa and Yaroslav Tserkovnyak},
journal= {arXiv preprint arXiv:1901.01208},
year = {2019}
}