Enhancement in A-B super-exchange interaction with Mn 2+ substitution in Mg-Zn ferrites as a heating source in hyperthermia applications

Abstract We report nanoparticles of Mn 2+ doped Mg 0.5 Zn 0.5−x Mn x Fe 2 O 4 ( x = 0, 0.125, 0.250, 0.375, 0.500) ferrites synthesized via co-precipitation route for hyperthermia applications. The prepared samples have been characterized by XRD, FT-IR, FE-SEM, VSM and Photoluminescence spectroscopy for various physical properties. The variation in structural parameters has been obtained with Mn 2+ substitution. The confirmation of intrinsic vibration of metal ions at octahedral sites and tetrahedral sites obtained with the help of FT-IR spectra has been reported. The inception of soft-ferri-magnetic behaviour with Mn 2+ substitution ( x > 0) has been obtained. The variation in magnetic behaviour with Mn 2+ substitution indicates enhancement in A-B super-exchange interaction. The confirmation of enhancement in A-B super-exchange interaction with the help of Yafet-Kittel angles and proposed cation distribution has also been reported. The room temperature photoluminescence spectra show a non-linear variation in band edge emission with Mn 2+ substitution. The nanoparticles have shown soft ferri-magnetic behaviour for Mn 2+ doped samples and results support the candidature of synthesized nanoparticles for hyperthermia applications.