各向异性
材料科学
透射电子显微镜
纳米颗粒
磁化
磁性纳米粒子
磁各向异性
球体
饱和(图论)
凝聚态物理
矫顽力
磁强计
核磁共振
比吸收率
磁热疗
分析化学(期刊)
磁场
化学
纳米技术
光学
物理
数学
量子力学
天文
组合数学
色谱法
电信
天线(收音机)
计算机科学
作者
Hafsa Khurshid,Javier Alonso,Zohreh Nemati,Manh‐Huong Phan,P. Mukherjee,M. L. Fdez-Gubieda,J.M. Barandiarán,H. Srikanth
摘要
Spherical and cubic exchange-coupled FeO/Fe3O4 nanoparticles, with different FeO:Fe3O4 ratios, have been prepared by a thermal decomposition method to probe anisotropy effects on their heating efficiency. X-ray diffraction and transmission electron microscopy reveal that the nanoparticles are composed of FeO and Fe3O4 phases, with an average size of ∼20 nm. Magnetometry and transverse susceptibility measurements show that the effective anisotropy field is 1.5 times larger for the cubes than for the spheres, while the saturation magnetization is 1.5 times larger for the spheres than for the cubes. Hyperthermia experiments evidence higher values of the specific absorption rate (SAR) for the cubes as compared to the spheres (200 vs. 135 W/g at 600 Oe and 310 kHz). These observations point to an important fact that the saturation magnetization is not a sole factor in determining the SAR and the heating efficiency of the magnetic nanoparticles can be improved by tuning their effective anisotropy.
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