https://en.wikipedia.org/wiki/Ferrite_bead
ferrite bead vs inductor
Ferrite beads should almost exclusively be reserved for low-current, noise-sensitive branch rails (such as PLLs, ADCs, audio codecs, or Ethernet/USB PHY analog domains). Placing a ferrite bead between a DC-DC converter and a digital processor core frequently causes brownouts, kernel panics, and unstable boot cycles.