Neutron Diffraction and Mössbauer Studies of Zinc Ferrite

Abstract

It is shown by neutron diffraction and Mössbauer spectrometry that the formation of a long range magnetic order in zinc ferrite depends sensitivily on the content of divalent iron. The experimental data favour a non collinear model of the magnetic structure

Density-functional description of spinelZnFe2O4

“…Of course, we do not suggest that taking into account Hubbard correlations is necessary only when the density-functional description is completely wrong, for example, giving a metallic solution when experimentally the system is insulating. ZnFe 2 O 4 is a well-characterized antiferromagnetic insulator, with high-spin Fe, and a low-ordering temperature T N ϭ10.5 K. A complex spin structure is present in clean samples, [6][7][8][9][10][11] with observable short-range dynamic order persisting up to at least 10T N . This is reflected in a strong diffuse magnetic peak both above and below T N .…”

Crystallite size induced crossover from paramagnetism to superparamagnetism in zinc ferrite nanoparticles

“…Thus presence of spin-orbit coupling reduces magnetic interaction, on the other hand magnetization is affected by presence of Fe 2+ ions in ZF32 and ZF61 [30]. To investigate origin of enhanced t 2g and e g states along with concentration of Fe ions, O K-edge spectra was recorded and shown in states hybridized with transition metal 4s and 4p states [44,45].…”

“…Cation inverstion of zinc ferrite at room temperature is estimated using neutron diffraction studies in past [26][27][28][29]. Though, a combination of neutron diffraction studies alongwith Mössbauer spectroscopy is successful to establish magnetism of nanosized zinc ferrite at room temperature [30], however techniques are restricted due to tedious measurements process and requirement of large amount of samples [18][19][20][21][22][23][24][25][26]. Combining these techniques König et al studied the effect of Fe 2+ content on ZnFe 2 O 4 .…”