This PDF file includes:

• Section S1. Spectrum
• Section S2. Majority dynamics
• Section S3. Two separated core levels for Ni
• Section S4. Energy integrated signals
• Fig. S1. High-harmonic spectrum reflected from the FeNi sample.
• Fig. S2. Transient occupations in Fe and Ni majority channels.
• Fig. S3. Schematic depiction on the influence of two separated core levels for Ni.
• Fig. S4. Energy integrated magnetization dynamics for Fe and Ni in Fe₅₀Ni₅₀.

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