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Size Dependence Of Specific Power Absorption Of Fe3O4 Particles In AC Magnetic Field

M. Ma, Y. Wu, Jie Zhou, Yongkang Sun, Y. Zhang, N. Gu
Published 2004 · Physics

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Abstract The specific absorption rate (SAR) values of aqueous suspensions of magnetite particles with different diameters varying from 7.5 to 416 nm were investigated by measuring the time-dependent temperature curves in an external alternating magnetic field (80 kHz, 32.5 kA/m). Results indicate that the SAR values of magnetite particles are strongly size dependent. For magnetite particles larger than 46 nm, the SAR values increase as the particle size decreases where hysteresis loss is the main contribution mechanism. For magnetite particles of 7.5 and 13 nm which are superparamagnetic, hysteresis loss decreases to zero and, instead, relaxation losses (Neel loss and Brownian rotation loss) dominate, but Brown and Neel relaxation losses of the two samples are all relatively small in the applied frequency of 80 kHz.
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