Magnetic force microscopy and energy loss imaging of superparamagnetic iron oxide nanoparticles

Bruno Torre*, Giovanni Bertoni, Despina Fragouli, Andrea Falqui, Marco Salerno, Alberto Diaspro, Roberto Cingolani, Athanassia Athanassiou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We present quantitative, high spatially resolved magnetic force microscopy imaging of samples based on 11 nm diameter superparamagnetic iron oxide nanoparticles in air at room temperature. By a proper combination of the cantilever resonance frequency shift, oscillation amplitude and phase lag we obtain the tip-sample interaction maps in terms of force gradient and energy dissipation. These physical quantities are evaluated in the frame of a tip-particle magnetic interaction model also including the tip oscillation amplitude. Magnetic nanoparticles are characterized both in bare form, after deposition on a flat substrate, and as magnetically assembled fillers in a polymer matrix, in the form of nanowires. The latter approach makes it possible to reveal the magnetic texture in a composite sample independently of the surface topography.

Original languageEnglish (US)
Article number202
JournalScientific Reports
StatePublished - 2011
Externally publishedYes

ASJC Scopus subject areas

  • General


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