  Magnetic tunnel junctions comprising of an insulator sandwiched between two
ferromagnetic films are the simplest spintronic devices. Theoretically, these
can be modeled by a metallic Hamiltonian in both the lattice and the continuum
with an addition of Zeeman field. We calculate conductance at arbitrary
orientations of the easy axes of the two ferromagnets. When mapped, the lattice
and the continuum models show a discrepancy in conductance in the limit of a
large Zeeman field. We resolve the discrepancy by modeling the continuum theory
in an appropriate way.
