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Poster De Conférence Année : 2018

Sensitivity performance of magnetic field sensor based on magnonic crystals

Résumé

Recent works [1, 2] presented an exploratory investigation of high sensitive magnetic field sensors based on magnonic crystals. They highlighted their strong potential for detecting weak magnetic fields with small-sized sensor operated at room temperature. The working principle relies on the propagation of surface magnetostatic spin-wave through a periodic structure, called magnonic crystals. These materials are made by periodically spatially modulating the magnetic properties along the propagation line of the spin wave. This structure acts as a reflector whenever the spatial periodicity matches the spin wave wavelength, resulting in a band-gap in the transmission spectrum. In [1, 2], the measurement of the complex transmission coefficient (S 21) shows a significant frequency shift of the band-gap absorption peak depending on the applied DC magnetic field. As a consequence, authors propose to use these variations as a magnetic field sensor. We investigate the ability of magnonic crystals to be used as a magnetometer and measured its expected output sensitivity, expressed in unit of V/T, according to the external magnetic field variations. For this, a sine electromagnetic wave at a fixed frequency, f exc = 1 GHz, is applied to the magnonic crystal. The induced spin wave propagates along the main length direction. When the external DC magnetic field varies, the amplitude of the sensed signal at f exc strongly changes, resulting in an AM signal. Based on a classical amplitude demodulation conditioning circuitry, an output sensitivity of 200 V/T is obtained. Considering, presently, that dominating noise sources are those due to the electronic conditioning circuitry, such results allow to predict a sensor equivalent magnetic noise level around 20 pT/√Hz in white noise region.

Domaines

Electronique
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Dates et versions

hal-03716349 , version 1 (07-07-2022)

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  • HAL Id : hal-03716349 , version 1

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Hellah Balleh, Olivier Haas, Basile Dufay, Sébastien Saez, Christophe Dolabdjian. Sensitivity performance of magnetic field sensor based on magnonic crystals. European Magnetic Sensors and Actuators (EMSA) Conference 2018, Jul 2018, Athens, France. ⟨hal-03716349⟩
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