Ferromagnetic core inductor Ferromagnetic-core or iron-core inductors use a magneticquartz core made of a ferromagnetic or ferrimagnetic material such as iron or ferrite to increase the inductance. A magneticaf4502 core can increase the inductance of a coil by a factor of several thousand, by increasing the magnetic field due to its higher magnetic permeability.AD6480JST However the magnetic properties of the core material cause several side effects which alter the behavior of the inductor and require special construction:Hysteresis:SSM2010 Changing or reversing the magnetic field in the core also causes losses due to the motion of the tiny magnetic domains it is composed of. The energy loss is proportionalMC33262P to the area of the hysteresis loop in the BH graph of the core material. Materials with low coercivity have narrow hysteresis loops and so low hysteresis losses.