Investigation of power generation mechanism and anisotropy of Fe-Ga magnetostrictive alloy single crystal based on magnetic domain observations

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Abstract

Recent developments in the field of vibration-based power generators have highlighted the advantages of using Fe-Ga alloys; these are excellent-magnetostrictive materials having good mechanical properties, which makes them well suited for use as magnetostrictive elements. A rectangular Fe-Ga element oriented along the 100 direction in a U-shaped unimorph device produces a higher power generation efficiency than samples with other orientations such as 110 and 111. The crystal growth direction of the ingots and plane orientation of the elements have a minimal effect on the power-generation efficiency. The observations of the magnetic domain and elastic properties suggest that the anisotropy in power generation is attributable to the anisotropic magnetic and elastic properties of the Fe-Ga alloy. Thus, a high-performance, vibration-based power generator using the Fe-Ga alloy should be fabricated using elements with a 100 orientation, cut from a single-crystal Fe-Ga ingot.

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Takahashi, T., Simura, R., Fujieda, S., Kawamata, T., Suzuki, S., & Fukuda, T. (2019). Investigation of power generation mechanism and anisotropy of Fe-Ga magnetostrictive alloy single crystal based on magnetic domain observations. Japanese Journal of Applied Physics, 58(10). https://doi.org/10.7567/1347-4065/ab3e60

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