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Photoexcitation and shaping of a propagating surface plasmon polariton (SPP)on silver and gold microstructures are well established and lead to thediscovery of the plasmonic spin-Hall effect recently. Whereas silver is oftenthe material of choice due to its exceptional low plasma frequency and weakdamping, similar observations have not been reported for ferromagnetic metals.In this work, we report on propagating SPPs on Ni$_{80}$Fe$_{20}$microstructures imaged by photoemission electron microscopy (PEEM) incombination with a tunable femtosecond laser system at MHz repetition rate.Circular dichroic (CD) images in threshold PEEM show clear edge-induced SPPswith sub-micrometer wavelength and propagation length of about 3.5 $\mu$m.Analysis of the interference patterns as well as the coupling of the opticalspin angular momentum to the observed fringe fields reveal propagationcharacteristics exclusive to evanescent waves and the presence of the plasmonicspin-Hall effect. Our work provides direct evidence that many materials with ahigh plasma frequency allow for excitation and observation of propagating SPPsat the dielectric/metal interface via CD PEEM imaging, enablingmagnetoplasmonic investigation of common ferromagnets on nanometer length andfemtosecond time scales.

Plasmonic Spin-Hall Effect of propagating Surface Plasmon Polaritons in Ni$_{80}$Fe$_{20}$ microstructures