Quantitative simulation of temperature-dependent magnetization dynamics and equilibrium properties of elemental ferromagnets

Abstract

Atomistic spin model simulations are immensely useful in determining temperature-dependent magnetic properties but are known to give the incorrect dependence of the magnetization on temperature compared to experiment owing to their classical origin. We find a single-parameter rescaling of thermal fluctuations which gives quantitative agreement of the temperature-dependent magnetization between atomistic simulations and experiment for the elemental ferromagnets Ni, Fe, Co, and Gd. Simulating the subpicosecond magnetization dynamics of Ni under the action of a laser pulse, we also find quantitative agreement with experiment in the ultrafast regime. This enables the quantitative determination of temperature-dependent magnetic properties, allowing for accurate simulations of magnetic materials at all temperatures.