  We analyze the specific heat variations as a function of an external magnetic
field of a simple model of superlattice that includes (i) in--plane
ferromagnetic exchange, (ii) interplane ferromagnetic exchange, (iii) dipolar
interactions, (iv) magnetocristalline anisotropy. The calculations are carried
out at the spin wave level. The interplay between the existence of a canting
transition and the anisotropy of the structure generates non trivial behavior
for the spin wave contribution to the low temperature specific heat as a
function of an external magnetic field when dipolar interactions and
magnetocristalline anisotropy are taken into account.
