Magnetic Flux Concentration Effects in Cantilever Magnetoelectric Sensors

PROJECT TITLE :

Magnetic Flux Concentration Effects in Cantilever Magnetoelectric Sensors

ABSTRACT:

This paper investigates the resonant bending-mode response of cantilever magnetoelectric (ME) sensors, with concentrate on the magnetic behavior in an external applied magnetic field, in a very theoretical study. A system of coupled linear elastostatic/elastodynamic and electrostatic/magnetostatic equations is solved using a pair of-D and 3-D finite-component method simulations. The magnetic field is applied at the boundaries of an air-filled volume, surrounding the entire ME sensor, to consider the geometry-dependent deformation of the magnetic field in the presence of materials with high permeability. The deformation of the magnetostrictive (MS) material is calculated and generates an electric potential across a piezoelectric (PE) layer. Structuring the conductive MS layer is necessary to outline a pickup region, if the MS layer is produced on top of the PE layer, to reinforce the sensor output. For economical excitation of the resonant bending mode, the tip of the cantilever also needs to be covered with an MS material. Thus, an air gap is critical to electrically insulate each MS regions and has got to be as little as possible to not decrease the magnetic field penetrating into the MS layer. The induced electric potential across the pickup region is optimized for a Metglas-AlN-Si thin-film ME sensor with an length:width:height ratio of 100:20:three. a pair of-D simulations are performed showing reasonable agreement in induced voltage with approximately twenty% deviation compared with three-D simulations, but with much lower computation times.

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