arxiv:2608.02021

A posteriori error analysis for the second-order BDF method for the Landau-Lifshitz-Gilbert equation

Published on Aug 3

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Abstract

A rigorous a posteriori error estimate for the tangent plane scheme of the Landau-Lifshitz-Gilbert equation is derived using BDF(2) time stepping and adaptive finite elements.

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The tangent plane scheme (TPS) is a well-established discretization of the Landau-Lifshitz-Gilbert (LLG) equation. However, rigorous a posteriori error estimates have not been established. In this work, we derive a rigorous a posteriori error estimate for the TPS based on the second-order backward differentiation formula (BDF(2)) in time and finite elements of arbitrary polynomial degree in space. The proposed estimators provide computable upper bounds for the temporal and spatial discretization errors on adaptive meshes with variable time-step sizes. This result establishes the mathematical foundation for fully adaptive algorithms for the LLG equation.

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