Acoustic cilia arrays using electrochemically-synthesized Galfenol nanowires and heterostructures (original) (raw)

The Journal of the Acoustical Society of America, 2009

Abstract

A novel cilia design is introduced that incorporates a newly discovered magnetostrictive family of Fe–Ga alloys, also called Galfenol, into self‐assembled, vertical nanopores to fabricate nanocantilevers. The mechanical response of the cilia to stimuli can be detected without direct contact by detecting their magnetic output via giant magnetoresistive sensors, similar to hard drive heads which can also be grown in nanoarrays. The electrochemistry of alloys involving non‐ideal metals is very complex, so finite element modeling was used to simulate growth parameters and successful growth was achieved. A variety of nanowire geometries were produced, including segmented Galfenol with alternating nonmagnetic material to overcome the shape anisotropy of the nanowires. In addition, the mechanical properties of this new material were measured to determine the effects of nanostructuring. Finally, the nanowires were actuated using an external field to show their potential actuators as well as sensors. [Work support...

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