  The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) collaboration aims to search
for the neutron electric dipole moment (nEDM) with unprecedented precision. One
of the essential elements for the nEDM measurement is a polarization analyzer
of ultracold neutrons (UCNs), whose main component is a magnetized thin iron
film. Several thin iron films were deposited on aluminum and silicon ubstrates
and were characterized by vibrating sample magnetometry and cold-neutron
reflectometry. A magnetic field required to saturate the iron film is $\sim$12
kA/m for those on the aluminum substrates and 6.4 kA/m for the silicon
substrates. The magnetic potential of the iron films on the Si substrate was
estimated to be 2 T by the neutron reflectometry, which is sufficient
performance for an UCN polarization analyzer of the nEDM measurement.
