Three-dimensional angle-resolved photoemission spectra of EuO thin film

Highlights: •We report the electronic structure of EuO (0 0 1) films using synchrotron radiation angle-resolved photoemission spectroscopy. •We observed clear dispersions of the Eu 4f and O 2p states and these behaviors are consistent with the band calculation. •Despite of the thin film, the isotropic electronic structure was observed. •The itinerant Eu 4f state play an important role for the high ferromagnetic ordering temperature. -- Abstract: We report the electronic structure of EuO thin films not only parallel to but also perpendicular to the (0 0 1) plane using synchrotron radiation angle-resolved photoemission spectroscopy. As a result, the electronic structure perpendicular to the (0 0 1) plane is consistent with in-plane electronic structure in spite of the thin films. This result implies that the electronic structure of EuO thin films is consistent with that of the bulk materials