AC Magnetic Technique to Measure Specific Absorption Rate of Magnetic Nanoparticles |
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Authors: | S A Gudoshnikov B Y Liubimov Y S Sitnov V S Skomarovsky N A Usov |
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Affiliation: | 1. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, (IZMIRAN), 142190, Troitsk, Moscow region, Russia 2. Ltd. “Magnetic and Cryoelectronic Systems”, 142190, Troitsk, Moscow region, Russia
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Abstract: | The electrodynamic method is applied to determine the specific absorption rate (SAR) of an assembly of superparamagnetic nanoparticles as a function of frequency and magnetic field amplitude. The home made frequency-adjustable electromagnet is used to create a nearly uniform magnetic field in a core gap of a volume 1×3×3 cm3 in the frequency range f=10–150 kHz and for magnetic field amplitudes up to H 0=250 Oe. Two oppositely connected pick-up coils are used to record the electromotive force signal (EMF) generated by magnetic nanoparticles. By integrating the EMF signal one can determine the low-frequency hysteresis loops of the assembly and the assembly SAR. Using this method the measurement of SAR has been carried out for magnetite nanoparticles with an average diameter D=25 nm. The electrodynamic method is shown to be capable of measuring a small amount of magnetic nanoparticles, up to 5×10?5 g, dispersed in a solid matrix. The maximal SAR ~?80 W/g has been obtained for the magnetite nanoparticle assembly investigated. |
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