GALFENOL is the latest magnetostrictive material to be invented, and is currently under development. Originally invented in 1998 by the Magnetic Materials Group at NSWC-CD, GALFENOL is slowly emerging into the real world. While its magnetostriction is only 1/3rd to 1/4th that of Terfenol-D, GALFENOL is a much more robust material allowing it to be used in mechanically harsh environments with minimal shock hardening.