Micromachined magnetoflexoelastic resonator based magnetometer

Gokhan Hatipoglu, Srinivas A. Tadigadapa

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Abstract

In this paper, we demonstrate the performance of a magnetoflexoelastic magnetometer consisting of a micromachined ultra-thin (7.5 μm) quartz bulk acoustic resonator on which 500 nm thick magnetostrictive Metglas® (Fe85B5Si10) film is deposited. The resonance frequency of the unimorph resonator structure is sensitively affected by the magnetostrictively induced flexoelastic effect in quartz and is exploited to detect low frequency (<100 Hz) and nanoTesla magnetic fields. The resonance frequency shift is measured by tracking the at-resonance admittance of the resonator as a function of the applied magnetic field. The frequency shifts are linearly correlated to the magnetic field strength. A minimum detectable magnetic flux density of ∼79 nT has been measured for 10 Hz modulated magnetic field input signals which corresponds to a frequency sensitivity of 0.883 Hz/μT.

Original languageEnglish (US)
Article number192406
JournalApplied Physics Letters
Volume107
Issue number19
DOIs
StatePublished - Nov 9 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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