We present GPU accelerated simulations to calculate the annihilation energy of magnetic skyrmions in an atomistic spin model considering dipole-dipole, exchange, uniaxial-anisotropy and Dzyaloshinskii-Moriya interactions using the simplified string method. The skyrmion annihilation energy is directly related to its thermal stability and is a key measure for the applicability of magnetic skyrmions to storage and logic devices. We investigate annihilations mediated by Bloch points as well as annihilations via boundaries for various interaction energies. Both processes show similar behaviour, with boundary annihilations resulting in slightly smaller energy barriers than Bloch point annihilations.
@article{arxiv.1804.07135,
title = {GPU Accelerated Atomistic Energy Barrier Calculations of Skyrmion Annihilations},
author = {Paul Heistracher and Claas Abert and Florian Bruckner and Christoph Vogler and Dieter Suess},
journal= {arXiv preprint arXiv:1804.07135},
year = {2019}
}
Comments
Corrected sign in dipole term (equation 1 and 7) and adapted the phase diagram in figure 3. Updated acknowledgement