Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597277
Title: Magnetic MEMS actuators
Author: Cao, J.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2010
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Abstract:
Magnetic MEMS actuators are presently still relatively under-researched as compared to their electrostatic, piezoelectric and electro-thermal counterparts. Most existing magnetic MEMS actuators are limited to simply delivering a rotational output. The research presented in this thesis aims to develop novel magnetic MEMS actuators with complex structures that are capable of delivering more sophisticated and useful mechanical outputs than the existing devices. The study begins with an attempt to solve the problem of bending a freestanding ferromagnetic cantilever beam with an applied magnetic field. Analytical and numerical models have been constructed and the modelling results are compared to experimental results obtained from a microscopic and a laser measurement system. NiFe alloy has been used as both the magnetic and mechanical element. The magnetic and mechanical properties of electroplated NiFe have been experimentally characterized. Fabrication processes for creating freestanding NiFe structures have been designed and optimized via a parametric experimental study. Finally, novel ferromagnetic microstructures have been designed by combining the motions of more than one ferromagnetic beam. Preliminary magnetic actuation tests have been carried out in order to verify the design ideas.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.597277  DOI: Not available
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