We analyze, both experimentally and numerically, the nonlinear regime of photo-induced coherent magnetization dynamics in cobalt-doped yttrium iron garnet films. Photo-magnetic excitation with femtosecond laser pulses reveals a strongly response spin subsystem significant increase effective Gilbert damping. By varying fluence external magnetic field, we show that this nonlinearity originates an...

An important progress was recently done in numerical approximation of weak solutions to a micromagnetic model equation. The problem with the nonconvex sideconstraint of preserving the length of the magnetization was tackled by using reduced integration. Several schemes were proposed and their convergence to weak solutions was proved. All schemes were derived from the Landau-Lifshitz-Gilbert for...

For the Landauâ??Lifshitzâ??Gilbert (LLG) equation of micromagnetics we study linearly implicit backward difference formula (BDF) time discretizations up to order $5$ combined with higher-order non-conforming finite element space discretizations, which are based on weak formulation due Alouges but use approximate tangent spaces that defined by $L^2$-averaged instead nodal orthogonality constrai...

The propagation of magnons in temperature gradients is investigated within the framework of an atomistic spin model with the stochastic Landau-Lifshitz-Gilbert equation as underlying equation of motion. We analyze the magnon accumulation, the magnon temperature profile, as well as the propagation length of the excited magnons. The frequency distribution of the generated magnons is investigated ...