  Dependence of photo-induced FMR (phi-FMR) on incident angle of excitation and
probing laser beams has been studied in a [Co (dCo = 0.78 nm) / Pd (dPd = 0.81
nm) ]5 multi-layer film with the aim to find experimentally the limitation of
inducement and detection of magnetization dynamics with oblique light
incidence. We have found, in the experiments changing the incident angle of a
pump beam, that phi-FMR is observed up to the grazing incident angle of 88
degrees with p-polarized excitation pulses, whereas it disappears at the
incidence angle of around 65 degrees with s-polarized excitation. As for the
experiments changing the incident angle of a probe beam, phi-FMR disappears at
the incidence angle of 65 degrees for both s- and p-polarizations, whereas it
reappears with further increasing the angle for the p-polarization and vanishes
at 75 degrees.

Optics