Non-exponential magnetic relaxation in magnetic nanoparticles for hyperthermia

Magnetic nanoparticle based hyperthermia emerged as a potential tool for treating malignant tumours. The efficiency of the method relies heavily on knowledge magnetic properties samples; in particular, frequency dependent complex susceptibility is vital to optimize irradiation conditions and provide feedback material science developments. We study frequency-dependent an aqueous ferrite suspension first time using non-resonant resonant radiofrequency reflectometry. identify optimal measurement standard solenoid coil, which capable providing up 150 MHz. result matches those obtained from resonator few discrete frequencies. agreement between two different methods validates our approach. Surprisingly, dynamic cannot be explained by exponential relaxation behavior even when we consider particle size-dependent distribution parameter.