Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 44, Issue 11, Pages 4452-4455Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2008.2002005
Keywords
Hyperthermia; hysteresis loss; iron oxide; magnetite; nanoparticle; thermoablation
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We have fabricated ferromagnetic Fe-oxide nanoparticles as a candidate of hysteresis-loss heating materials used for hyperthermia and thermoablation and examined heating abilities. The coercivities were controlled in a range between 50 Oe and 240 Oe. The temperature-rising characteristics were examined for randomly oriented solid nanoparticles by applying a 17-kHz ac magnetic field with an amplitude up to 550 Oe. A temperature rising rate Delta T/Delta t was proportional to the square of the peak magnetic field H(0) in the lower H(0) region; however, the relation dose not hold at higher H(0). The maximum loss power was obtained to be 4 W/g, which is smaller than the value expected from the minor loop experiment (13.7 W/g). The reason for small heating capability is discussed.
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