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Heating characteristics of ferromagnetic iron oxide nanoparticles for magnetic hyperthermia

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13 Author(s)
Kita, Eiji ; Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan ; Hashimoto, Shinji ; Kayano, Takeru ; Minagawa, Makoto
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Heating characteristics of Fe oxide nanoparticles designed for hyperthermia were examined. Samples with coercive forces from 50 to 280 Oe(codoped magnetite) were produced with a coprecipitation technique following by hydrothermal reaction. The maximum specific loss powers (SLPs) of 420 W/g was obtained at 117 kHz (640 Oe) for a dispersant sample with coercive force of 280 Oe (ATH9D). SLPs measured on dry powder samples at 17 kHz and measured at 117 kHz on dispersant samples were compared. The measured SLP amplitudes are lower for 17 kHz and higher for 117 kHz than those expected from ferromagnetic dc minor loops. For the 117 kHz case, friction of particles in a carrier fluid (similar mechanism to Brown relaxation in superparamagnetic dispersant samples) is considered to contribute to the heating mechanism.

Published in:

Journal of Applied Physics  (Volume:107 ,  Issue: 9 )

Date of Publication:

May 2010

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