Picotesla magnetic sensors for low-frequency applications

S. H. Liou, Xiaolu Yin, Stephen E. Russek, Ranko Heindl, F. C.S. Da Silva, John Moreland, David P. Pappas, L. Yuan, J. Shen

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

We demonstrate a simple low-power, magnetic sensor system suitable for high-sensitivity magnetic-field mapping, based on solid-state magnetic tunnel junction devices with minimum detectable fields in a 100 pT range at room temperature. In this paper, we discuss a method that uses multilayer thin films to improve the performance of the soft ferromagnetic layer in magnetoresistive sensor applications, by reducing the coercivity and/or improving the reversibility. We have used it in the design of our new magnetic sensor. This sensor has a sensitivity as high as 750%/mT. The magnetic sensor only dissipates 1 mW of power while operating under an applied voltage of 1 V.

Original languageEnglish (US)
Article number6028053
Pages (from-to)3740-3743
Number of pages4
JournalIEEE Transactions on Magnetics
Volume47
Issue number10
DOIs
StatePublished - Oct 2011

Keywords

  • Magnetic concentrators
  • magnetic noise
  • magnetic sensor
  • magnetic tunnel junction (MTJ)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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