Thermal fluctuations in antiferromagnetic nanostructures
Abstract
A theoretical model is developed that can accurately analyze the effects of thermal fluctuations in antiferromagnetic (AFM) nano-particles. The approach is based on Fourier series representation of the random effective field with cut-off frequencies of physical origin at low and high limits while satisfying the fluctuation-dissipation theorem at the same time. When coupled with the formalism of a Langevin dynamical equation, it can describe the stochastic N\'eel vector dynamics with the AFM parameters, circumventing the arbitrariness of the commonly used treatments in the micro-magnetic simulations. Subsequent application of the model to spontaneous N\'eel vector switching provides a thermal stability analysis of the AFM states. The numerical simulation shows that the AFM states are much less prone to the thermally induced accidental flips than the ferromagnetic counterparts, suggesting a longer retention time for the former.
Cite
@article{arxiv.1806.11130,
title = {Thermal fluctuations in antiferromagnetic nanostructures},
author = {Yuriy G. Semenov and Xiniy Xu and Ki Wook Kim},
journal= {arXiv preprint arXiv:1806.11130},
year = {2019}
}
Comments
19 pages, 4 figures