Title :
Size and Concentration Effects on High Frequency Hysteresis of Iron Oxide Nanoparticles
Author :
Eggeman, Alexander S. ; Majetich, Sara A. ; Farrell, Dorothy ; Pankhurst, Quentin A.
Author_Institution :
Dept. of Phys., Carnegie Mellon Univ., Pittsburgh, PA
fDate :
6/1/2007 12:00:00 AM
Abstract :
High-frequency hysteresis measurements were performed on two different types of hydrosols of iron oxide particles: fully dispersed and highly clustered. The fully dispersed sol showed superparamagnetic behavior across the frequency range investigated, while the clustered sample exhibited significant hysteresis. The hysteretic losses were then directly related to magnetic hyperthermia measurements in a sinusoidal field of amplitude 10 mT at 140 kHz, where the clustered sample heated by up to 25degC in 1000 s while the dispersed sample at similar concentration showed no measurable heating.
Keywords :
biomagnetism; iron compounds; magnetic hysteresis; magnetic leakage; nanobiotechnology; nanoparticles; sols; superparamagnetism; 10 mT; 1000 s; 140 kHz; 25 degC; FeO; concentration effects; fully dispersed hydrosols; high frequency hysteresis; highly clustered hydrosols; hysteretic losses; iron oxide nanoparticles; magnetic hyperthermia; size effects; superparamagnetic behavior; Dispersion; Frequency; Hyperthermia; Iron; Loss measurement; Magnetic field measurement; Magnetic hysteresis; Nanoparticles; Particle measurements; Performance evaluation; Frequency response; hysteresis; magnetic particles;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.894127
