  We use lateral spin valves with varying interface resistance to measure
non-local Hanle effect in order to extract the spin-diffusion length of the
non-magnetic channel. A general expression that describes spin injection and
transport, taking into account the influence of the interface resistance, is
used to fit our results. Whereas the fitted spin-diffusion length value is in
agreement with the one obtained from standard non-local measurements in the
case of a finite interface resistance, in the case of transparent contacts a
clear disagreement is observed. The use of a corrected expression, recently
proposed to account for the anisotropy of the spin absorption at the
ferromagnetic electrodes, still yields a deviation of the fitted spin-diffusion
length which increases for shorter channel distances. This deviation shows how
sensitive the non-local Hanle fittings are, evidencing the complexity of
obtaining spin transport information from such type of measurements.
