Clustering of MnFeO nanoparticles and the effect of field intensity in the generation of heat for hyperthermia application.

MnFeO nanoparticles thinly coated with oleic acid were successfully synthesized via a co-precipitation technique. Morphological analysis shows the co-existence of different nanoparticle assemblies such as dense agglomeration, chain clustering, and random clustering, the effect of which was then reflected in the FTIR spectrum and magnetization behavior of the MnFeO nanoparticles. Induction heating study collectively discusses the association of dipolar energy and magnetic anisotropy energy with the applied field intensity in various nanoparticle clustering systems. The highest applied field intensity (H: 14.98 kAm) at a nanoparticle concentration of 2 mg ml shows a maximum specific absorption rate of 98.37 W g, which is attributed to the effect of threshold field amplitude surpassing the dipolar field energy. The nanoparticle clustering due to an interdigitated effect and chain clustering can effectively contribute to heat generation via Neelian and hysteresis loss mechanism at a suitable high field intensity.