Shape-Memory Alloy Enables the Conversion of Magnetic-Field Energy into Kinetic Energy

A magnetic shape-memory alloy composed of nickel, manganese, and gallium responds to magnetic fields and temperature, allowing for the conversion of magnetic-field energy into kinetic energy. Although similar in action to piezo-based or magnetostrictive materials, the patented NiMnGa single crystal produces strain outputs typically 10–100 times greater and exhibits energy density 8–50 times higher by changing its shape in response to the magnetic field. The alloy is offered as an alternative to conventional actuators, particularly for applications that require a large strain and light weight. To minimize the amount of magnetic energy required to elongate the material, a piece with a thin profile and wide cross section is preferred. As the elongation is a multiple of the length, a comparatively long strip is advantageous.

Goodfellow Corp.
Oakdale, PA, 800/821-2870