ferromagnetiliste kehade omadus tugevalt ja iseeneslikult magneetuda ning muutuda püsimagnetiks, a property, exhibited by certain ceramics, metals, alloys, and compounds of the transition (iron group), rare earth, and actinide elements, in which the internal magnetic moments spontaneosly organize in a common direction; ther effect gives rise to permeability considerably greater than that of vacuum, and to magnetic hysteresis, teatud keraamika, metallide ja sulamite, üleminekugrupi keemiliste ühendite jt omadus spontaalselt anda sisemist magnetilisi momente kindlas suunas
