  We present Vinamax, a simulation tool for nanoparticles that aims at
simulating magnetization dynamics on very large timescales. To this end, each
in dividual nanoparticle is approximated by a macrospin. Vinamax numerically
solves the Landau-Lifshitz equation by adopting a dipole approximation method,
while temperature effects can be taken into account with two stochastic
methods. It describes the influence of demagnetizing and anisotropy fields on
magnetic nanoparticles at finite temperatures in a space and time-dependent
externally applied field. Vinamax can be used in biomedical research where
nanoparticle imaging techniques are under developement.
