Large Linear and Volume Magnetostriction in Fe-Ga Alloys
The growth velocity has a significant effect on the preferred orientation of the directionally solidified Fe81Ga19 magnetostrictive alloy. Strong <100> preferred orientation was obtained for a velocity range from 10mm/h to 20mm/h. An excellent magnetostriction λ100 of 294×10-6 was achieved for the <100> oriented crystal at a pre-stress of 74.1MPa. Linear and volume magnetostrictions were investigated in the as-cast Fe81Ga19 alloys with A2 phase by measuring the change in length along the three-dimensional directions of the samples. Due to the contribution of the volume magnetostriction, the longitudinal magnetostriction increased from 27 ppm at 0.3 T to 47 ppm at 2.0 T. The volume magnetostriction can be drastically enhanced by doping Ga in Fe.
Young Won Chang, Nack J. Kim and Chong Soo Lee
C. B. Jiang et al., "Large Linear and Volume Magnetostriction in Fe-Ga Alloys", Materials Science Forum, Vols. 561-565, pp. 1117-1122, 2007