[15a-D419-1~9] 15.1 Bulk crystal growth

[15a-D419-7] Comparison of magnetostrictive characteristics of Fe-Ga prismatic single crystals grown by vertical Bridgman method in different processing directions

〇Kiyoshi Izumi¹, Kazuhiko Okubo¹, Masaaki Sato¹, Gen Fujii¹, Kento Kitabayashi¹ (1.Sumitomo Metal Mining)

Keywords:Fe-Ga, vertical Bridgman, magnetostriction

We have developed a manufacturing process of Fe-Ga magnetostrictive alloys which were available for materials of vibration power generators, from single crystal growth using a vertical Bridgman (VB) method to thin-plate processing. This time, we have cut two Fe-Ga prismatic single crystal ingots so as to parallel and perpendicular to the ingot side surfaces with a multi wire saw, and produced 32x8x1mm plates. Next, we measured the electrical impedance of 32x8x1mm plates and calculated the force factor α that is the electromechanical coupling factor in energy conversion process. Furthermore, we investigated the difference in force factor α depending on the cutting direction.