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Meeting MS&T22: Materials Science & Technology
Symposium Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
Presentation Title Optimizing Magnetostriction Coefficients in (FeGa)B Nanocrystalline Alloys
Author(s) Jenna K. Jaklich, Mohammad Tauhidul Islam, Matthew Willard, Bowen Dong, Alexander Yu, Yumi Ijiri, Emily Moore, Scott McCall
On-Site Speaker (Planned) Jenna K. Jaklich
Abstract Scope Galfenol, an (Fe,Ga)-based alloy, is interesting for sensor technologies because of its sizable magnetostriction coefficient; however, in order to be effective in these applications, the material’s magnetic softness must be improved. To reduce the coercivity, we have prepared a series of nanocrystalline galfenol-like alloys and examined their magnetic and structural properties. We report studies on a series of four synthesized (Fe80Ga20)100-xBx samples with x=8-17 prepared by rapid solidification and subsequent isothermal annealing. Samples were annealed at temperatures between 425C and 550C for up to four hours to examine the effects heat treatment has on the crystallinity of the samples. The sample with x=17 annealed at 450C for 30 minutes was found to have the largest magnetostriction 31 ppm, a median magnetization 138.7 (Am2/kg), but the smallest coercivity 2271 (A/m). Several crystalline phases but primarily the Fe3Ga (L12) phase were identified by XRD. (Supported by LLNL under Contract DE-AC52-07NA2)


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