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Nanomechanical torque magnetometry of an individual aggregate of similar to 350 nanoparticles

TitleNanomechanical torque magnetometry of an individual aggregate of similar to 350 nanoparticles
Publication TypeJournal Article
Year of Publication2015
AuthorsFirdous, T, Vick, D, Belov, M, Sani, FF, McDermott, A, Losby, JE, Bazylinski, DA, Prozorov, T, Potter, DK, Freeman, MR
JournalCanadian Journal of Physics
Volume93
Pagination1252-1256
Date Published11
Type of ArticleArticle
ISBN Number0008-4204
Accession NumberWOS:000364103900006
Keywordsassemblies, magnetic nanoparticles, magnetotactic bacteria, resonators, sensors
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 similar to 350 nanoparticles.

DOI10.1139/cjp-2014-0722
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