Permendur

Permendur is a cobalt-iron soft ferromagnetic alloy with equal parts of cobalt and iron which is notable for its high magnetic saturation level.

Coupled with its low coercivity and core losses, its high saturation and permeability makes Permendur useful as magnetic cores in transformers, electric generators and other electrical equipment.

Permendur is used for magnetic cores and pole pieces in lightweight transformers and electric motors used in aircraft.

[1][2] Most permendur alloys require heat treatment after fabrication to attain the best magnetic properties.

Equiatomic cobalt-iron alloys with more vanadium than permendur, 2-5%, are called Remendur.