  We study the dynamics of solitons in a Landau-Lifshitz equation describing
the magnetization of a three-dimensional ferromagnet with an easy axis
anisotropy. We numerically compute the energy dispersion relation and the
structure of moving solitons, using a constrained minimization algorithm. We
compare the results with those obtained using an approximate form for the
moving soliton, valid in the small momentum limit. We also study the
interaction and scattering of two solitons, through a numerical simulation of
the (3+1)-dimensional equations of motion. We find that the force between two
solitons can be either attractive or repulsive depending on their relative
internal phase and that in a collision two solitons can form an unstable
oscillating loop of magnons.
