We investigated the element-specific electronic structure of a half-metallic Weyl ferromagnet candidate ${\mathrm{Co}}_2\mathrm{FeSi}$ film by utilizing soft-x-ray resonant photoelectron spectroscopy and first-principles calculations with and without considering an on-site Coulomb interaction. An Fe $2p-3d$ resonant photoelectron experiment revealed that the Fe $3d$ states exist around 2 and 4 eV below the Fermi energy. Our calculations, based on the generalized gradient approximation without considering a Coulomb interaction at the Fe site, successfully reproduced the experimentally observed Fe $3d$ partial density of states. Our findings shed light on the highly controversial correlation effect of ${\mathrm{Co}}_2\mathrm{FeSi}$, offering valuable insights into its half metallicity and Weyl semimetallicity.

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• Density of states
• Electronic structure
• Magnetism
• Alloys
• Ferromagnets
• Half-metals
• Heusler alloy
• Magnetic thin films
• Weyl semimetal
• First-principles calculations
• Photoemission spectroscopy
• X-ray photoelectron spectroscopy