feeLLGood
Beyond first-order finite element schemes in micromagnetics. Magnetization dynamics in ferromagnetic materials is ruled by the Landau-Lifshitz-Gilbert equation (LLG). Reliable schemes must conserve the magnetization norm, which is a nonconvex constraint, and be energy-decreasing unless there is pumping. Some of the authors previously devised a convergent finite element scheme that, by choice of an appropriate test space -- the tangent plane to the magnetization -- reduces to a linear problem at each time step. The scheme was however first-order in time. We claim it is not an intrinsic limitation, and the same approach can lead to efficient micromagnetic simulation. We show how the scheme order can be increased, and the nonlocal (magnetostatic) interactions be tackled in logarithmic time, by the fast multipole method or the non-uniform fast Fourier transform. Our implementation is called feeLLGood. A test-case of the National Institute of Standards and Technology is presented, then another one relevant to spin-transfer effects (the spin-torque oscillator).
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References in zbMATH (referenced in 9 articles )
Showing results 1 to 9 of 9.
Sorted by year (- Akrivis, Georgios; Feischl, Michael; Kovács, Balázs; Lubich, Christian: Higher-order linearly implicit full discretization of the Landau-Lifshitz-Gilbert equation (2021)
- Chen, Jingrun; Wang, Cheng; Xie, Changjian: Convergence analysis of a second-order semi-implicit projection method for Landau-Lifshitz equation (2021)
- Grohs, Philipp; Hardering, Hanne; Sander, Oliver; Sprecher, Markus: Projection-based finite elements for nonlinear function spaces (2019)
- Kim, Eugenia; Wilkening, Jon: Convergence of a mass-lumped finite element method for the Landau-Lifshitz equation (2018)
- Exl, Lukas; Mauser, Norbert J.; Schrefl, Thomas; Suess, Dieter: The extrapolated explicit midpoint scheme for variable order and step size controlled integration of the Landau-Lifschitz-Gilbert equation (2017)
- Gutiérrez-Santacreu, Juan Vicente; Restelli, Marco: Inf-sup stable finite element methods for the Landau-Lifshitz-Gilbert and harmonic map heat flow equations (2017)
- Kim, Eugenia; Lipnikov, Konstantin: The mimetic finite difference method for the Landau-Lifshitz equation (2017)
- Alouges, François; de Bouard, Anne; Hocquet, Antoine: A semi-discrete scheme for the stochastic Landau-Lifshitz equation (2014)
- Kritsikis, E.; Vaysset, A.; Buda-Prejbeanu, L. D.; Alouges, F.; Toussaint, J.-C.: Beyond first-order finite element schemes in micromagnetics (2014)