By Dennis Blacksmith One of the lesser-known complexities of the new DFARS 252.225-7052 rules involves dopants used in rare earth magnets. Dopants are small amounts of additional elements intentionally added during the manufacturing process to enhance the performance of neodymium-iron-boron and samarium-cobalt magnets. Common dopants include dysprosium, terbium, praseodymium, and other rare earth elements. These additives are critical for improving temperature resistance, mag