There is no perfect machine that does not experience a certain type of loss. Hysteresis loss is unavoidable in electrical machines and transformers owing to the energy expended in alignment and reorientation of the magnetic domain. The study of magnetic behaviour of iron gives insight to the hysteresis loss and how a permanent or temporary magnet can be formed. Those materials Tha can easily be magnetised are called ferromagnetic materials. In-between ferromagnetic and diamagnetic material is paramagnetic material whose ability to be magnetized lies inbetween that of ferromagnetic and diamagnetic materials. Keep up the good work. The quality of your posts speaks for itself.