Entropy-reduced retention times in magnetic memory elements: A case of the Meyer-Neldel Compensation Rule
Mesoscale and Nanoscale Physics
2020-09-09 v1 Statistical Mechanics
Abstract
We compute mean waiting times between thermally-activated magnetization reversals in a nanodisk with parameters similar to a free CoFeB layer used in magnetic random access memories. By combining Langer's theory and forward flux sampling simulations, we show that the Arrhenius prefactor can take values up to 10 Hz, orders of magnitude beyond the value of 10 Hz typically assumed, and varies drastically as a function of material parameters. We show that the prefactor behaves like an exponential of the activation energy, which highlights a case of the Meyer-Neldel compensation rule. This suggests that modeling information retention times with a barrier-independent prefactor in such magnetic storage elements is not justified.
Keywords
Cite
@article{arxiv.2007.02152,
title = {Entropy-reduced retention times in magnetic memory elements: A case of the Meyer-Neldel Compensation Rule},
author = {L. Desplat and J. -V. Kim},
journal= {arXiv preprint arXiv:2007.02152},
year = {2020}
}
Comments
5 pages, 4 figures