Contact solitons as spin pistons in one-dimensional ferromagnetic channels
Abstract
Ferromagnetic channels subject to spin injection have been theoretically shown to sustain dissipative exchange flows (DEFs). In the strong injection regime, a soliton is stabilized at the injection site, which has been termed a contact soliton DEF or CS-DEF. Here, we investigate the modulation of CS-DEFs as a mechanism to inject magnons into a DEF. By varying the injection current, the parameters connecting the soliton with the DEF via a boundary layer are varied. These lead to a modification in the DEF which is interpreted as a spin piston. The injected magnons follow the expected dispersion relation of DEFs, akin to the Bogoliubov - de Gennes dispersion relation. This work demonstrates that changes in the injected current can pumping magnons along a ferromagnetic channel via dissipative exchange flows.
Keywords
Cite
@article{arxiv.2407.02628,
title = {Contact solitons as spin pistons in one-dimensional ferromagnetic channels},
author = {Medhanie Estiphanos and Ezio Iacocca},
journal= {arXiv preprint arXiv:2407.02628},
year = {2025}
}