论文标题
磁性纳米颗粒的特定吸收率：非线性AC敏感性
Specific absorption rate of magnetic nanoparticles: nonlinear AC susceptibility
论文作者
论文摘要
在磁性高温的背景下，使用了几个物理参数来优化热量产生，其中包括纳米颗粒浓度以及外部AC磁场的大小和频率。在这里，我们通过计算对特定吸收率的非线性贡献来扩展以前的工作，同时考虑（弱）颗粒间偶极相互作用和直流磁场。在先前的工作中，后者被证明可以在某些特定的几何形状和设置中增强SAR。我们发现，对AC敏感性的立方校正不会改变早期观察到的定性行为，但确实带来了特定吸收率的无忽略的定量变化，尤其是在相对较高的AC场强度下。顺便说一句，在基于AC易感性的方法中，我们在AC磁场强度$ H_ {0} $及其频率$ f $的产物上限上重新审视生理经验标准，并为其提供物理学的理由。
In the context of magnetic hyperthermia, several physical parameters are used to optimize the heat generation and these include the nanoparticles concentration and the magnitude and frequency of the external AC magnetic field. Here we extend our previous work by computing nonlinear contributions to the specific absorption rate, while taking into account (weak) inter-particle dipolar interactions and DC magnetic field. In the previous work, the latter were shown to enhance the SAR in some specific geometries and setup. We find that the cubic correction to the AC susceptibility does not modify the qualitative behavior observed earlier but does bring a non negligible quantitative change of specific absorption rate, especially at relatively high AC field intensities. Incidentally, within our approach based on the AC susceptibility, we revisit the physiological empirical criterion on the upper limit of the product of the AC magnetic field intensity $H_{0}$ and its frequency $f$, and provide a physicist's rationale for it.
