  Magnetic coupling between Ni_{81}Fe_{19} double thin films separated by an
insulating SiO_{2} spacer layer is investigated with structural measurements,
cross sectional imaging, magnetization measurements (BH loop) and transport
under the conditions of variable spacer thickness ranging from 0 to 5000
Angstroms. We investigate several models to explain the coercivity variation
with spacer thickness as well as the transport measurements.
