Development of micro-gas valve driven by magnetic field

Naoki Ogasawara, Teiko Okazaki, Chihiro Saito, Yasubumi Furuya

Research output: Contribution to journalArticlepeer-review


Giant magnetostrictive Fe-Pd and Fe-Ga alloys are promising as actuator/sensor materials with high respective velocity and stress created by magnetostriction. To apply them to a micro valve, we developed magnetostrictive actuators, that is, Fe80Ga20/Ni and Fe 70.4Pd29.6/Ni bimorph layers. These cantilever-type actuators can be bent by applying magnetic field parallel to length. An actuator point displaced about 270 μm under a low magnetic field of 37 kAm -1. Large (20 mm x 18 mm x 0.2 mm) and small (17.5 mm x 5 mm x 0.2 mm), (10 mm x 3 mm x 0.2 mm) actuators were applied to a micro-gas valves. The opening and closing action of a valve consisting of magnetostrictive bimorph layers can be controlled remotely by magnetic fields. Gas flow rate can be driven from 43 to 0 ml min-1 by increasing the magnetic field to 20 kA -1. The response time to the applied magnetic field is below 0.12 s. Moreover, the magnetostrictive actuator is excellent in durability.

Original languageEnglish
Pages (from-to)759-763
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number10
Publication statusPublished - 2009 Oct
Externally publishedYes


  • Magnetostriction
  • Micro-gas valve
  • Wireless actuator

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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