Factors affecting the heating efficiency of Mn-doped Fe3O4 nanoparticles

• Published in: Journal of magnetism and magnetic materials 2020-10, Vol.512, p.166992, Article 166992
• Main Authors: Shebha Anandhi, J., Antilen Jacob, G., Justin Joseyphus, R.
• Format: Article
• Language: English
• Subjects: Anisotropy; Doping; Electron paramagnetic resonance; Electron spin; Electron spin resonance; Heating; Hyperthermia; Infrared imaging; Iron oxides; Magnetic anisotropy; Magnetic properties; Mn ferrite; Nanoparticles; Polydispersity; Specific absorption rate; Spin resonance; Superparamagnetism; Thermography
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2020.166992

•MnxFe3-xO4 (x = 0, 0.1, 0.3 and 0.5) in the size range 10–13 nm were synthesized.•The Keff measured using electron spin resonance was between 15.3 and 16.5 kJ/m3.•The ESAR was obtained in the range of 15–21 × 10−9 W/gOe2Hz, employing IR thermography.•The ESAR decreased when the Keff was either 15.3 kJ/m3 or increased to 31.3 kJ/m3.•The effect of Keff and polydispersity on the SAR was analyzed scrupulously. MnxFe3-xO4 (x = 0, 0.1, 0.3 and 0.5) nanoparticles were synthesized using the co-precipitation method and its structural and magnetic properties were correlated to the heating characteristics in an ac magnetic field. The effective magnetic anisotropy of the samples measured using electron spin resonance was between 15.3 and 16.5 kJ/m3 with Mn-doping. The effective magnetic anisotropy increased to 31.3 kJ/m3 on doping Fe3O4 with Co. The hyperthermia response of the samples was tested using infrared thermography and the effective specific absorption rate (ESAR) was obtained in the range of 15–21 × 10−9 W/gOe2Hz. The ESAR decreased when the effective magnetic anisotropy was 16.5 kJ/m3, as well as when it increased to 31.3 kJ/m3. The effect of magnetic anisotropy and polydispersity on the hyperthermic efficiency was intensively analyzed employing theoretical models.