Mossbauer spectra of MnFez04 with various particle sizes in a longitudinal 50 kOe magnetic field show that the Fe ion occupancy of the A and B crystallographic sites depends on the particle size. The elevated N6el temperatures with decreasing particle sizes are attributed to an increased iron occupancy on the A sites; this in turn leads to an increase in the total superexchange interaction.

The exchange constants and electronic structure of manganese ferrite (MnFe2O4) were calculated using Becke’s density functional. The total exchange energy consists of Hartree–Fock (HF) and Becke’s density functional terms. We introduced one parameter w as the weight of HF’s contribution. We also introduced a parameter a to scale the radial part of the 3d wave functions of Fe ions. By varying w ...

Objective(s): For cancer cells, an efficient and selective drug delivery vehicle can remarkably improve therapeutic approaches. This paper focuses on the synthesis and characterization of magnetic MnFe2O4 NPs and their incorporation in a dual temperature and pH-responsive polymer, which can serve as an efficient drug carrier. Materials and Methods: MnFe2O4 NPs were synthesized by chemical co-pr...