... high permeability, super low coercivity and low saturation magnetic induction. Fe-Ni Soft Magnetic Alloy (Permalloy) Core 1. Material Grade: ... and small power transformer, low power magnetic amplifier, relay, head of magnetic recording device, zero sequence current transformer, power converter, ... state, according to the user’s actual usage requirements. Fe-Ni Soft Magnetic Alloy (Permalloy) Core