(A) Viability of ES-2 cells incubated for 24 h with different concentrations of CoMn-IONP and IONP nanoclusters (50–250 μg Fe/mL). *p < 0.05 when compared with non-treated cells. (B) Representative heating profiles of ES-2 cells incubated with media only (cells only), CoMn-IONP and IONP nanoclusters (50 μg Fe/mL) for 24 h, and subjected to AMF (420 kHz, 26.9 kA/m). (C) The viability of ES-2 cells incubated with CoMn-IONP nanoclusters, IONP nanoclusters (50 μg Fe/mL), and medium (AMF) for 24 h and exposed to AMF (420 kHz, 26.9 kA/m) for 30 min. *p < 0.05 when compared with untreated cells.