Modelling micromagnetism at elevated temperature
- Research Team
- Dmitri Chernyshenko
- Investigators
- Hans Fangohr
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.
The aim of the research project is to adapt the LLB equation to the continuum, FE-based model; in particular to devise a method for calculating the parameters of the model as well as for the verification of the results.
The extended model will be implemented in the micromagnetic simulation package nmag and applied to study nanoscale devices.
Categories
Physical Systems and Engineering simulation: Micromagnetics
Algorithms and computational methods: Boundary elements, FFT, Finite differences, Finite elements, 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