A method to design high SNR nanoscale magnetic sensors using an array of tunnelling magneto-resistance (TMR) devices

P. Gomez, D. Litvinov, S. Khizroev

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This paper presents a systematic method to design and calculate tunnelling magneto-resistance (TMR) sensors with high signal-to-noise ratio (SNR). The sensing module consists of four TMR devices arranged in a Wheatstone-bridge configuration. Closed-form equations were obtained to calculate TMR sensor current, array output voltage, magneto-resistance ratio, overall noise (thermal and shot) and SNR for a given bandwidth. Using this technique we were able to maximize the SNR by tuning the many parameters of the TMR devices. Typical SNR values are in excess of 45 dB.

Original languageEnglish (US)
Article number002
Pages (from-to)4396-4404
Number of pages9
JournalJournal of Physics D: Applied Physics
Volume40
Issue number15
DOIs
StatePublished - Aug 8 2007
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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