Size and concentration effects on high frequency hysteresis of iron oxide nanoparticles

被引：86

作者：

Eggeman, Alexander S. ^{[1
]}

Majetich, Sara A.

Farrell, Dorothy

Pankhurst, Quentin A.

机构：

[1] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[2] USN, Res Lab, Div Opt Sci, Washington, DC 20375 USA

[3] UCL, Dept Phys & Astron, London WC1E 6BT, England

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2007年 / 43卷 / 06期

基金：

美国国家科学基金会; 美国安德鲁·梅隆基金会;

关键词：

frequency response; hysteresis; magnetic particles;

D O I：

10.1109/TMAG.2007.894127

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 25 degrees C in 1000 s while the dispersed sample at similar concentration showed no measurable heating.

引用

页码：2451 / 2453

页数：3

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