Optimization of Zn–Mn ferrite nanoparticles for low frequency hyperthermia: Exploiting the potential of superquadratic field dependence of magnetothermal response

Magnetothermal applications of nanoparticles in biomedicine are currently limited by low thermal responses to oscillating magnetic fields on one side and detrimental physiological effects electromagnetic radiation the other side. In this paper, using Zn–Mn ferrite nanoparticles, we demonstrate that an appropriate choice size chemical composition results superquadratic (upto 5th power) dependence Specific Absorption Rate (SAR) a field (SAR proportional H 5 ). This gives opportunity obtain SAR values above 10 W/g field, while maintaining field-frequency product at level close Brezovich's limit ? 9 A/(m s).