Ames Laboratory; Physics and Astronomy; Chemical and Biological Engineering
Chemical and Biological Engineering, Physics and Astronomy, Ames Laboratory
IEEE Magnetics Letters
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)
Department of Energy Subject Categories
77 NANOSCIENCE AND NANOTECHNOLOGY
Iowa State University Digital Repository, Ames IA (United States)