Magnetostrictive materials transduce or convert magnetic energy to mechanical energy and vice versa. As a magnetostrictive material is magnetized, it strains; that is it exhibits a change in length per unit length. Conversely, if an external force produces a strain in a magnetostrictive material, the material's magnetic state will change. This bi-directional coupling between the magnetic and mechanical states of a magnetostrictive material provides a transduction capability that is used for both actuation and sensing devices. Magnetostriction is an inherent material property that will not degrade with time.

Etrema Products Inc. is the leading supplier of magnetostrictive materials based on Terfenol-D as well as of complete actuator and sensor solutions, including drive electronics.


ActuatorCrossSection Cross-sectional view of Etrema Sonic Actuator with mechanical and magnetic preload





At AMZ a detailed analysis of the Etrema AA-050 magnetostrictive actuator was conducted and compared to their existing line of magnetic actuators. The aim of this project is to evaluate the feasability of fast acting fuel injection valves based on magnetostrictive devices, especially for use in extremely durable, high-pressure Diesel injection applications.


MessplatzComputer-automated evaluation of magnetic actuators at AMZ








To learn more about the characteristics of magnetostrictive devices, please refer to report Etrema_Actuator.pdf