  First-principles calculations are performed to investigate f magnetism in
A$_2$Ti$_2$O$_7$ (A=Eu, Gd, Tb, Dy, Ho, Er, Yb) magnetic pyrochlore oxides. The
Hubbard U parameter and the relativistic spin orbit correction is applied for
more accurate description of the electronic structure of the systems. It is
argued that the main obstacle for first-principles study of these systems is
the multi-minima solutions of their electronic configuration. Among the studied
pyrochlores, Gd$_2$Ti$_2$O$_7$ shows the least multi-minima problem. The
crystal electric field theory is applied for phenomenological comparison of the
calculated spin and orbital moments with the experimental data.
