Nanomechanical torque magnetometry of an individual aggregate of ∼350 nanoparticles

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1139/cjp-2014-0722
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  1. NINT
FormatText
TypeArticle
Journal titleCanadian Journal of Physics
ISSN0008-4204
1208-6045
Volume93
Issue11
Pages1252–1256
Abstract
The measurements of magnetic hysteresis for aggregates of nanoparticles deposited on a surface are reported. Magnetite nanoparticles derived from magnetotactic bacteria are studied using nanomechanical torque magnetometry. The nanoparticles are deposited on high-stress Si3N4 membranes, to allow inspection by electron microscopy, followed by focused ion-beam milling of torsional resonators precisely located to capture selected aggregates within the membrane area. Torque magnetometry is performed using the resonators. We investigate also the magnetic torque-driven AC resonant modes of the modified supporting membrane. The observations are compared to numerical simulations of the mechanical modes, and to micromagnetic modeling of the hysteresis of a specific measured cluster of ∼350 nanoparticles.
Publication date
PublisherNRC Research Press
LanguageEnglish
Peer reviewedYes
NPARC number23001566
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