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 prop- erties, but are known to give the incorrect dependence of the magnetization on temperature compared to exper- iment 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 experi- ment for the elemental ferromagnets Ni, Fe, Co and Gd. Simulating the sub-picosecond magnetization dynam- ics 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.

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• Spin Caloritronics
• Atomistic spin model simulations of magnetic nanomaterials
• Ab-initio calculations of exchange interactions, spin-wave stiffness constants, and Curie temperatures of Fe, Co, and Ni
• Fokker-Planck and Landau-Lifshitz-Bloch Equations for Classical Ferromagnets
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• Self-Consistent Gaussian Approximation for Classical Spin Systems: Thermodynamics
• Unified decoupling scheme for exchange and anisotropy contributions and temperature-dependent spectral properties of anisotropic spin systems

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