This article reports the synthesis of MnFe 2 O 4 nanoparticles (NPs) by thermal decomposition method in different solvents such as diphenyl ether, benzyl ether and 1-octadecene with varying boiling point (bp). The physical and chemical properties of all the NPs were systematically studied. The NPs prepared using benzyl ether as solvent formed in cubic shape whereas spherical particles are formed in diphenyl ether and 1-octadecene. The solvent plays a significant role in the reaction and influence the morphology of the NPs. The hydrophobic particles are made hydrophilic by ligand exchange using tetramethyl-ammonium 11-aminoundecanote and the colloidal dispersion of the NPs are used for magnetic induction in varying alternating magnetic field (AMF) of frequency 314 kHz. The specific absorption rates that measure the heat generation in NPs are found to vary with the concentration of the NPs as well as the field strength. The cubic shaped NPs shows comparatively better SAR than the spherical NPs.

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