A High-Resolution Planar Hall Effect Magnetometer for Ultra-Low Frequencies

Asaf Grosz, Vladislav Mor, Shai Amrusi, Igor Faivinov, Eugene Paperno, Lior Klein

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Recent reports have demonstrated field resolutions of planar Hall effect magnetometers in the picotesla range. Here, we report a significant improvement in the field resolution of these sensors by decreasing their preamplifier white noise and the sensing element 1/f noise. We design, build, and test a miniature transformer-matched amplifier with a record noise level of 200 pV/ Hz and improve the fabrication process of the sensing element to increase its volume and reduce its associated 1/f noise. The magnetometer exhibits a magnetic resolution of ∼ 200 pT/ Hz at 1 Hz and ∼ 600 pT/ Hz at 0.1 Hz. These values are threefold better than previously reported results. The obtained resolution may enable applications for which high-end magnetometers, such as fluxgates, are currently used. We discuss routes for the further improvement of the magnetic field resolution.

Original languageEnglish
Article number7395273
Pages (from-to)3224-3230
Number of pages7
JournalIEEE Sensors Journal
Issue number9
StatePublished - 1 May 2016


  • Low noise amplifier
  • Magnetic sensor
  • Magnetometer
  • Planar Hall effect
  • Transformer noise matching

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering


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