  This paper shows the correlation between chemical order, lattice strains and
magnetic properties of Heusler Co2FeAl films epitaxially grown on MgO(001). A
detailed magnetic characterization has been performed using vector field
magnetometery combined with numerical Stoner-Wohlfarth analysis. We demonstrate
the presence of three types of in-plane anisotropies: one biaxial, as expected
for the cubic symmetry, and other two uniaxial ones. The three anisotropies
show different behavior with the annealing temperature. The biaxial anisotropy
shows a monotonous increase. The uniaxial anisotropy, parallel with the hard
biaxial axes, related to the chemical homogeneity, decreases, while the other,
supposed to have magnetostatic origin, remains constant.
