Effects of particle dipole interaction on the ac magnetically induced heating characteristics of ferrite nanoparticles for hyperthermia
Effects of particle dipole interaction on the ac magnetically induced heating characteristics of ferrite nanoparticles for hyperthermia
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DOI：
10.1063/1.3211120
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发表时间：
2009-08-24
影响因子：
4
通讯作者：
Chung, Kyung-Won
中科院分区：
文献类型：
--
作者：
Jeun, Minhong;Bae, Seongtae;Chung, Kyung-Won
在优化磁性纳米颗粒的交流磁感应加热特性时，磁粒子偶极相互作用是一个重要的物理参数。当交流磁场为140Oe，频率为110kHz时，通过提高粒子偶极相互作用能，软质MFe2O4(M=Mg，Ni)纳米粒子的交流加热温度从17.6℃提高到94.7℃(MgFe2O4)，从13.1C提高到103.1℃(NiFe2O4)。粒子偶极子相互作用引起的磁滞损耗增加是交流加热特性显著改善的主要物理原因。
Magnetic particle dipole interaction was revealed as a crucial physical parameter to be considered in optimizing the ac magnetically induced heating characteristics of magnetic nanoparticles. The ac heating temperature of soft MFe2O4 (M=Mg,Ni) nanoparticles was remarkably increased from 17.6 to 94.7 degrees C (MgFe2O4) and from 13.1 to 103.1 degrees C (NiFe2O4) by increasing the particle dipole interaction energy at fixed ac magnetic field of 140 Oe and frequency of 110 kHz. The increase in "magnetic hysteresis loss" that resulted from the particle dipole interaction was the main physical reason for the significant improvement of ac heating characteristics.