Computational Modelling Group

Modelling micromagnetism at elevated temperature

Research Team
Dmitri Chernyshenko
Hans Fangohr, Kees de Groot, Peter de_Groot

Atomistic spins in permalloy at room temperature

Magnetisation dynamics at the nanometer scale is commonly modelled using the Landau-Lifshitz-Gilbert (LLG) equation. However, the LLG equation cannot describe materials close to the Curie temperature, or materials where the temperature varies rapidly in time or space. Such cases can be described by a more detailed Landau-Lifshitz-Bloch (LLB) equation which allows the magnetisation to change in magnitude. The continuum form of the LLB equation was originally derived based on the mean-field approximation; it reproduces the qualitative behaviour but cannot provide precise values of the parameters which have to be estimated from numerical simulation using more precise models.


Physical Systems and Engineering simulation: Micromagnetics

Algorithms and computational methods: Boundary elements, FFT, Finite differences, Molecular Dynamics, Monte Carlo, Multi-physics, Multi-scale

Simulation software: Nmag

Programming languages and libraries: C, C++, MPI, OCaml, PETSc, Python

Computational platforms: Iridis, Linux

Transdisciplinary tags: Complex Systems, HPC, Scientific Computing, Software Engineering