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A fully integrated surface micromachined magnetic microactuator with a multilevel meander magnetic core

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2 Author(s)
Ahn, Chong H. ; Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; Allen, M.G.

A fully integrated magnetic microactuator using surface micromachining techniques is presented. To achieve this device, low-resistance meander conductors located in a single plane were interwoven with multilevel meander magnetic cores. This `wrapped' solenoid (with the core wrapped around the conductor) was fabricated in a fully integrated fashion. A magnetic microactuator was realized by incorporating a surface micromachined nickel-iron cantilever beam as part of the magnetic circuit of the core. The nickel-iron cantilever beam was 2.5 μm thick, 25 μm wide, and 780 μm long, and the magnetic circuit contained seventeen turns of meander-type solenoid coils. Cantilever beam tip deflection of 6 μm in the vertical direction was achieved when a DC voltage less than 1 V (and resulting drive current of 800 mA) was applied to the coils. This fully integrated multilevel topology offers advantages in a variety of micromagnetic applications, where actuators can be fabricated on the same substrate with an integrated circuit and actuated with low voltages

Published in:

Microelectromechanical Systems, Journal of  (Volume:2 ,  Issue: 1 )