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[AC/DC & MEMS modules, 3.5a version] Microcantilever magnetic dynamic actuation
Posted 8 Oct 2009, 11:37 GMT-4 4 Replies
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I'm working on the magnetic dynamic actuation of a microcantilever placed near a permanent magnet.
The cantilever is a bi-layer structure with a magnetization assigned to the upper layer.
My goal is to find with a frequency responce analysis the "resonane curve" (amplitude vs excitation frequency) under the magnetic load.
To simplify things I have realized a trial multiphysics model in 2d.
I have coupled plane stress module with the AC/DC/Quasi-static Magnetic/perpendicular corrents/small signal analysis module.
Magnetic force acting on the cantilever is given as boundary force through the Maxwell stress tensor.
In the static case (i.e. a static magnetic field deflects the cantilever) everything seems work correctly.
I'm not sure instead on the results obtained performing the frequency sweep.
Should I have, for instance, to split the magnetic force in a static component (whose name is set in the subdomain settings of the "bias" application mode) and a dynamic component (whose name is set in the subdomain settings of the "time-harmonic" application mode) and assign both of them to the cantilever boundaries?
To my knowledge there are no Comsol models dealing with the electro- or magneto-dynamics actuations of microstructures.
Any suggestion about such a problem is welcome.