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Magneto-optical micromechanical systems for magnetic field mapping

Abstract : A new method for magnetic field mapping based on the optical response of organized dense arrays of flexible magnetic cantilevers is explored. When subjected to the stray field of a magnetized material, the mobile parts of the cantilevers deviate from their initial positions, which locally changes the light reflectivity on the magneto-optical surface, thus allowing to visualize the field lines. While the final goal is to be able to map and quantify non-uniform fields, calibrating and testing the device can be done with uniform fields. Under a uniform field, the device can be assimilated to a magnetic-field-sensitive diffraction grating, and therefore, can be analyzed by coherent light diffraction. A theoretical model for the diffraction patterns, which accounts for both magnetic and mechanical interactions within each cantilever, is proposed and confronted to the experimental data.
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Submitted on : Monday, September 11, 2017 - 3:11:08 PM
Last modification on : Sunday, January 3, 2021 - 4:14:01 PM

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Alain Truong, Guillermo Ortiz, Mélissa Morcrette, Thomas Dietsch, Philippe Sabon, et al.. Magneto-optical micromechanical systems for magnetic field mapping. Scientific Reports, Nature Publishing Group, 2016, Scientific Reports, 6, pp.31634. ⟨10.1038/srep31634⟩. ⟨hal-01585345⟩



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