Evaluation of the inverse magnetostrictive effect in heat-treated Fe-Co wire/polymer composites

Kenichi Katabira, Natsuko Kimura, Takahiro Yamazaki, Fumio Narita

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In recent years, the innovative technology of energy harvesting from ambient energy (eg, shock or vibration) has become necessary for Internet of Things (IoT) wearable devices. Moreover, these devices are expected to be lightweight, robust, and have a high efficiency of energy conversion. In this study, magnetostrictive polymer composites were fabricated with as-drawn or heat-treated Fe-Co wires. Mechanical tests and analyses were conducted to investigate their stress-rate-dependent sensor characteristics, and cyclic compression tests were carried out to measure the output voltage of these samples. A simple nonlinear magnetomechanical coupling model of the magnetostrictive wire/polymer composites was used to predict the internal stress in the wire. The experimental results showed that the output voltage density of the heat-treated Fe-Co wire/polymer composite was larger than that of the as-drawn one, and the heat treatment enhanced the inverse magnetostrictive characteristics of the Fe-Co wire.

Original languageEnglish
Article numbere81
JournalMaterial Design and Processing Communications
Issue number5
Publication statusPublished - 2019 Oct 1


  • composite design
  • energy harvesting
  • Fe-Co wire
  • heat treatment
  • inverse magnetostriction
  • magnetostrictive composites
  • sensors


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