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Strain-Modulated Multiferroic Magnetic Field Sensors Exploiting Second Harmonic Frequency Conversion
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DOI：10.1109/jsen.2026.3700046.png)
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Abstract
En 中文
Low-noise sensors are needed to detect low-frequency, low-amplitude magnetic signals such as those produced by the heart. In this work, a multiferroic sensor composed of an FeGaB magnetostrictive layer and an AlN piezoelectric layer is used to demonstrate a novel strain-modulation technique that allows for the decoupling of the actuation and sensing frequencies. This sensor utilizes the fundamental length extensional mode to stress-modulate the FeGaB and the second harmonic length extensional mode to amplify and sense the modulated low-frequency magnetic field. This approach reduces the large electrical carrier signal which is associated with strain-modulated sensors by over 100 times. A noise spectral density of 10 nT/<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\surd $ </tex-math></inline-formula>Hz and 22 nT/<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\surd $ </tex-math></inline-formula>Hz is observed at 100 and 1 Hz, respectively, for a device with an area of 0.13 mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>.
Keywords:
Bio-magnetic recording
multiferroic sensor
strain modulation
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