  Magnetic properties of fcc structured ferromagnetic films with the number of
spin layers up to seventy was described using third order perturbed Heisenberg
Hamiltonian. The variation of magnetic easy direction, magnetic energies in
easy and hard directions, magnetic anisotropy energy and the angle between easy
and hard directions was investigated by varying the number of spin layers. Spin
exchange interaction, magnetic dipole interaction, second and fourth order
magnetic anisotropies, in and out of plane applied magnetic fields,
demagnetization factor and stress induced anisotropy were considered in the
model. Because magnetic dipole interaction and demagnetization factor represent
microscopic and macroscopic properties of the sample, respectively, both these
terms were incorporated in our theoretical model. Although our model is a
semi-classical model, some discrete variations of angle of easy axis were
observed. Our theoretical data qualitatively agree with experimental data of Fe
and Ni ferromagnetic films.
