A yellow core of sputtered iron. You can see chokes with this type of core in power supplies and in places where high current flows through the choke. If you bring a magnet close to a choke with a yellow core, its inductance will not change. This is necessary to prevent magnetic fields from affecting the choke's inductance, and such chokes have high saturation inductance.
Bring a magnet close to a ferrite choke, and it will change its inductance by tens of times
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