Highly sensitive low field Lorentz-force MEMS magnetometer

Sofiane Ben Mbarek, Nouha Alcheikh, Hassen M. Ouakad, Mohammad I. Younis

Research output: Contribution to journalArticlepeer-review

Abstract

We present a highly sensitive Lorentz-force magnetic micro-sensor capable of measuring low field values. The magnetometer consists of a silicon micro-beam sandwiched between two electrodes to electrostatically induce in-plane vibration and to detect the output current. The method is based on measuring the resonance frequency of the micro-beam around the buckling zone to sense out-of-plane magnetic fields. When biased with a current of 0.91 mA (around buckling), the device has a measured sensitivity of 11.6 T−1, which is five orders of magnitude larger than the state-of-the-art. The measured minimum detectable magnetic field and the estimated resolution of the proposed magnetic sensor are 100 µT and 13.6 µT.Hz−1/2, respectively. An analytical model is developed based on the Euler–Bernoulli beam theory and the Galerkin discretization to understand and verify the micro-sensor performance. Good agreement is shown between analytical results and experimental data. Furthermore, the presented magnetometer is promising for measuring very weak biomagnetic fields.
Original languageEnglish (US)
JournalScientific Reports
Volume11
Issue number1
DOIs
StatePublished - Nov 4 2021

ASJC Scopus subject areas

  • General

Fingerprint

Dive into the research topics of 'Highly sensitive low field Lorentz-force MEMS magnetometer'. Together they form a unique fingerprint.

Cite this