Si nanowire probe with Nd-Fe-B magnet for attonewton-scale force detection

Yong Jun Seo, Masaya Toda, Takahito Ono

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


In this study, we have developed a 210 nm-wide and 32 μm-long silicon nanowire probe with a silicon mirror using a silicon-on-insulator wafer in order to improve sensitivity of force detection for magnetic resonance force microscopy (MRFM). Additionally, a Nd-Fe-B magnet has been integrated at the end of the nanowire. The fabricated nanowire probe shows a resonance frequency of 11.256 kHz and a factor of 12 800 after annealing at 800 °C for 2 h in forming gas. The probe exhibits attonewton sensitivity, and the measurement of force mapping based on electron spin resonance is demonstrated for 3D imaging of radicals. The detected force and magnetic field gradient are approximately 82 aN and ∼70.1 G μm-1 at room temperature. The radical density is calculated as 4.6 × 1018 spins cm-3.

Original languageEnglish
Article number045015
JournalJournal of Micromechanics and Microengineering
Issue number4
Publication statusPublished - 2015 Apr 1


  • force detection
  • magnetic resonance force microscopy
  • silicon nanowire

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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