Calculation of minimum parameters required for low-field low-size nano nuclear magnetic resonance (NanoNMR)

Pablo Gomez, Dmitri Litvinov, Sakhrat Khizroev

Research output: Contribution to journalArticlepeer-review


The objective of this research is to calculate the minimum parameters required to make low-field low-size nano nuclear magnetic resonance (NanoNMR) a viable technology and potentially one of the future Lab-On-Chip technologies. By low field we signify an externally applied magnetic field of less than 0.5 T, and by low size we mean a magnet whose largest physical dimension does not exceed 25 mm. The goal is to develop small and cost-effective NMR spectrometers that can be used at room temperature in a small office environment. In this paper, tunneling magneto resistance (TMR) devices are used to sense the NMR signal. The parameters that are calculated are: minimum sample size and concentration required to obtain an adequate NMR signal, TMR sensor size, and its distance to the sample, RF coil size, RF frequency, and power. The nanoscale TMR sensors proposed in this paper were designed using an in-house developed software tool. The optimally calculated TMR sensors have Fe50 Co 50 PL and FL layers, an area of 100 nm x 100 nm, a 0.3-nm-thick Al2 O3 barrier and is biased at 200 mV.

Original languageEnglish (US)
Pages (from-to)4464-4467
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number11 PART 2
StatePublished - Nov 2008
Externally publishedYes


  • Giant magneto-resistance (GMR)
  • Lab-On-Chip
  • Nano(NMR)
  • Nuclear magnetic resonance (NMR)
  • Tunneling magneto resistance (TMR)

ASJC Scopus subject areas

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


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