Magnets have been known to humanity since long ago. In Ancient Greece the ability of some rocks to draw chunks of iron had already been discovered. Contemporary scientists found out that not only materials on the base of iron (ferrites) possess magnetic properties. Nowadays among the most powerful magnets are samarium-cobalt (or samarium) magnets. Their principal feature is high temperature resistance and preserving of their initial magnetization intensity at temperatures up to 350°С.
