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

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Abstract

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
Volume1
DOIs
StatePublished - Dec 1 2011

ASJC Scopus subject areas

  • General

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