Dynamic response of the magnetization to rapid heating in the picosecond regime

The problem of the dynamic response of a magnetic system to pulsed laser heating was addressed. The magnetic system is modeled at the atomistic level, using a classical spin Hamiltonian with the Heisenberg form of the exchange interaction and a local uniaxial anisotropy. The material parameters used corrersponds to permalloy. It was shown that the rapid decrease of the magnetization is predicted naturally by a simple atomistic model based Landau-Lifshitz-Gilbert (LLG) equation with Langevin dynamics.