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Comparative Study of Magnetic Properties of Nanoparticles by High-Frequency Heat Dissipation and Conventional Magnetometry

TitleComparative Study of Magnetic Properties of Nanoparticles by High-Frequency Heat Dissipation and Conventional Magnetometry
Publication TypeJournal Article
Year of Publication2014
AuthorsMalik, V, Goodwill, J, Mallapragada, S, Prozorov, T, Prozorov, R
JournalIEEE Magnetics Letters
Volume5
Pagination4000104
Date Published12
Type of ArticleArticle
ISBN Number1949-307X
Accession NumberWOS:000347916300018
Keywordsfield, hyperthermia, magnetite nanoparticles, Nanomagnetics, size, specific absorption rate
Abstract

The rate of heating of similar to 15 nm uniformly-sized magnetic aqueous nanoparticles suspension by high-amplitude and high-frequency ac magnetic field induced by the resonating LC circuit was measured. The results are analyzed in terms of specific energy absorption rate (SAR). Fitting field amplitude and frequency dependences of SAR to the linear response theory, magnetic moment per particles was extracted. The value of magnetic moment was independently evaluated from dc magnetization measurements of a frozen colloid by fitting field-dependent magnetization to a Langevin function. The two methods produced similar results, which are compared to the theoretical expectation for this particle size. Additionally, analysis of SAR curves yielded effective relaxation time.

DOI10.1109/lmag.2014.2368517
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