Fig. 4

a Temperature-time curves of NiFe MNPs, with l = 500 nm and d = 350 nm, for increasing magnetic field strength from 15.9 to 47.8 kAm^− 1 (200 to 600 Oe). b Temperature-time curves of NiFe MNPs, with d = 350 nm. The magnetic field strength of 47.8 kAm^− 1 (600 Oe), while the MNP length l increased from to 500 nm. c Tabulated SAR values for NiFe MNPs, with l = 100–500 nm and d = 350 nm under a magnetic field strength of 15.9 to 47.8 kAm^− 1 (200 to 600 Oe). d Theoretical SAR values for NiFe MNPs, with l = 100–500 nm and d = 350 nm