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High-resolution angle- and spin-resolved photoemission spectroscopy revealsnew features of the electronic structure of the ferromagnetic triple-layeredruthenate Sr$_4$Ru$_3$O$_{10}$. There are narrow spectral peaks $\sim$30 meVbelow the Fermi-level in two regions of the Brillouin zone: a hole-like band atthe zone-center and a saddle-point van Hove singularity at the zone edge. BelowT$_c$ each feature is almost completely spin-polarized, with opposite signpolarization and with strong Kondo-coherence-like temperature-dependentspectral weight variation suggestive of strong Hund's metal correlations. Inaddition, there are distinct Fermi surfaces for wide electron-like minorityspin bands around the zone center and narrow hole-like majority spin Fermisurface contours around the zone corners. The origin of these features is ingeneral agreement with density functional calculations, if they are shifted toreduce the exchange splitting, and scaled to take into account effects ofcorrelation. Furthermore, the deduced narrow band origins from the tri-layersplitting of $d_{xz/yz}$ orbitals implies a layer-specific spin-polarizationcontribution from the narrow bands. Over a larger energy range, netspin-majority polarization of incoherent Ru $d$-bands is observed to extenddown to the top of the oxygen bands, where additional narrow oxygen bandscontribute to the magnetism with spin-minority polarization.

Spin-resolved electronic structure of ferromagnetic triple-layered ruthenate Sr$_4$Ru$_3$O$_{10}$