  We performed depth-dependent low-energy muon spin spectroscopy ($\mu$SR)
studies on three palladium 100 nm thin films, both undoped and doped with 170
ppm of iron. Muons implanted in the surface and substrate interface region
probe an increased local magnetic field compared to the inner part of the
sample. The field increase extends over a few nanometers, it is
temperature-independent (in the range of 3.7 - 100 K), stronger for the
iron-doped samples and accompanied by an increase in local field inhomogeneity.
We consider various potential origins for this magnetic surface state, such as
adsorbents and supressed d-states. Our conclusion is that orbital moments
induced at the surface / interface by localized spins and charges are the most
likely explanation, potentially accompanied by magnetic moments due to crystal
irregularities.
