Alloys magnetostrictive

Included for comparison (H. Uchida et al. (2002) Progress in thin films of giant magnetostrictive alloys, J. Mag. Mag. Mater., 239, 540-5). 

Samarium 62 Sm Reactor control and neutron shielding, magnets, luminescent and infra-red absorbing glasses, catalysts, ceramics, electronic devices, magnetostrictive alloys, misch metal... 

Terbium 65 Tb Lasers, electronic materials, erasable optical memory substrate, magnetostrictive alloys... 

Holmium 67 Ho Electronic devices, catalysts, refractories, magnetic materials, magnetostrictive alloys... 

Shape Memory Alloys (SMAs) and Magnetostrictive Alloys... 

Claeyssen, F. Giant Magnetostrictive Alloys Actuators. Proc. Magnetoelastic Effects and Applications Conf. L.Lanotte, Pub. Elsevier, Holland, 1993, pp. 153-159, or J. Appl. Electromagnetics in Mater. 5 (1994) pp. 67-73... 

CedeU, T. New magnetostrictive alloy for rapid conversion of electric energy to mechanical motion. Proc. Actuators 90, Axon, Bremen, Germany (1990), pp. 156-161... 

The prototypical system is a dispersion of 25 % of micron-sized iron particles in gel of silicone mbber and silicone oil but polyurethanes and other mbbers have been investigated. When cured in a magnetic field the particles form chains [148]. After curing, the stiffness of the material increases in a magnetic field. At a strain of 5 %, an increase in stress of about 50 % is seen in a field of 123 kA/m (1500 Oe). In a study of magnetostriction, a field of 800 kA/m (1 Tesla) produced a strain of 0.3 % in a sample preloaded in compression to 100 kPa, a strain comparable to magnetostrictive alloys (Terfenol-D) [149]. These materials also show an electric field response if they can be formed to be nonconductive [150]. A shear stress of a few kPa can be produced at a field of 1 MV/m. 

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