In this study, the Fe₃O₄ nanoparticles with particle size from 5 to 20 nm were synthesized using the thermal decomposition method. Magnetic hyperthermia measurements on these nanoparticles show moderate values of the specific absorption rates (SAR) in applied AC magnetic fields of amplitude 200 Oe and frequencies of 450 kHz. The highest value of SAR is 123.31 W/g for 20 nm Fe₃O₄ MNPs. The theoretical results within the framework of the linear response theory were used for comparing with experimental ones. The value of SAR obtained through magnetothermal measurements is found to be in excellent agreement with that obtained using the linear response theory. These results open the path to a more accurate prediction for synthesis of magnetic fluids for applications in magnetic hyperthermia.

在这项研究中，使用热分解方法合成了粒径为5至20 nm的Fe ₃ O ₄纳米颗粒。在这些纳米粒子上的磁热测量结果显示，在振幅为200 Oe且频率为450 kHz的交流磁场中，比吸收率（SAR）处于中等值。对于20 nm Fe ₃ O ₄ MNP ，SAR的最高值为123.31 W / g 。将线性响应理论框架内的理论结果与实验结果进行了比较。SAR的价值通过磁热测量获得的结果与使用线性响应理论获得的结果非常一致。这些结果为用于磁热疗中的磁流体合成开辟了更准确的预测途径。