Weak thermal fluctuations impede steering of chiral magnetic nanobots
Soft Condensed Matter
2025-12-02 v1
Abstract
Rotating magnetic field is an efficient method of actuation of synthetic colloids in liquids. In this Letter we theoretically study the effect of the thermal noise on torque-driven steering of magnetic nanohelices. Using a combination of numerical and analytical methods, we demonstrate that surprisingly a weak thermal noise can substantially disrupt the orientation and rotation of the nanohelix, severely impeding its propulsion. The results of Langevin simulations are in excellent agreement with the numerical solution of the Fokker-Planck equation and the analytical effective field approximation.
Keywords
Cite
@article{arxiv.2504.05069,
title = {Weak thermal fluctuations impede steering of chiral magnetic nanobots},
author = {Ashwani Kr. Tripathi and Konstantin I. Morozov and Boris Y. Rubinstein and Alexander M. Leshansky},
journal= {arXiv preprint arXiv:2504.05069},
year = {2025}
}