Impact of Na-Alginate Polymer on Fe₃O₄/Na-Alginate Magnetic Gel to their Néel Relaxation Time for Magnetic Hyperthermia Applications

Fe₃O₄/Na-Alginate magnetic gel has been successfully fabricated using the encapsulated method. The primary objective was to characterize how the contribution of Na-Alginate hydrogel composition influences the magnetic properties, SAR, and Néel relaxation time. The crystal and magnetic structures were analyzed using the diffraction patterns of Fe₃O₄, which acts as a filler in the gels. This analysis showed that Fe₃O₄ possesses a cubic crystal structure and a ferromagnetic spin arrangement with a propagation vector k and the irreducible representation Γ5. Saturation magnetization was assessed using a VSM, showing a decrease in saturation as the Na-Alginate hydrogel composition increased. We also investigated magnetic hyperthermia under a magnetic field of 129.189 Oe at 420 kHz, resulting in SAR and intrinsic loss power values of about 90.189 W/g and 2.0297 nHm2/kg, respectively. These values are also impacted by Néel relaxation of Fe₃O₄ within the magnetic gels.