Abstract
A hybrid imaging mode was developed for characterizing samples of magnetic FeNi3 nanoparticles, which combines contact-mode atomic force microscopy (AFM) with magnetic modulation of samples. For conventional magnetic imaging modes of AFM, magnetically coated tips are used directly as a sensor to measure the relatively long-range forces of magnetic samples in a noncontact configuration. For the magnetic sample modulation (MSM) configuration, however, the changes in sample dynamics form the basis for measurements of material properties using contact-mode AFM. Nanoparticles are driven to vibrate in response to an externally applied electromagnetic field, and a nonmagnetic tip is used as a motion sensor for directly mapping the vibration with contact-mode. Intermetallic nanoparticles of FeNi3 were used as a model nanomaterial, synthesized by either conventional oven heating or microwave preparation. By slowly scanning an AFM probe across vibrating nanoparticles, changes in the frequency and amplitude of the s...
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