We exhibit some large variations solutions of the Landau-Lifschitz equations
as the exchange coefficient ε^2 tends to zero. These solutions are
described by some asymptotic expansions which involve some internals layers by
means of some large amplitude fluctuations in a neighborhood of width of order
ε of an hypersurface contained in the domain. Despite the nonlinear
behaviour of these layers we manage to justify locally in time these asymptotic
expansions