Magnetostrictive materials change their shape or dimensions when exposed to a magnetic field. This property allows them to convert magnetic energy into mechanical energy, making them useful in various applications, such as sensors and actuators. Common magnetostrictive materials include terfenol-D and galfenol. In practical use, magnetostrictive devices can detect changes in magnetic fields or convert electrical signals into physical movement. This technology is often employed in industrial automation, robotics, and ultrasonic transducers, where precise control and measurement are essential for performance and efficiency.