Publication Date

11-13-2014

Department

Ames Laboratory; Physics and Astronomy; Chemical and Biological Engineering

Campus Units

Chemical and Biological Engineering, Physics and Astronomy, Ames Laboratory

OSTI ID+

1221934

Report Number

IS-J 8775

DOI

10.1109/LMAG.2014.2368517

Journal Title

IEEE Magnetics Letters

Volume Number

5

First Page

4000104

Abstract

The rate of heating of 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.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Department of Energy Subject Categories

77 NANOSCIENCE AND NANOTECHNOLOGY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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