Models of the magnetic structure of zinc ferrite

Geometrically Frustrated Magnetic Materials

“…Early studies of magnetic properties found that long range order sets in below 10 K and that the magnetic structure is complex and probably incommensurate with the chemical cell although all magnetic peaks could be indexed with k ¼ (0 0 ½). [181] Later, a very detailed study involving neutron diffraction, mSR and Mö ssbauer spectroscopy was undertaken on a sample with negligible inversion. [182] The same magnetic structure was found but the spin dynamics could also be monitored.…”

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 .…”

Magnetic irreversibility in ultrafine ZnFe2O4 particles

“…3 [4][5][6] For samples with ␦ϭ1, antiferromagnetic order of the Fe ions appears below T N ϭ9 -11 K. 4,7,8 This low ordering temperature compared to other MFe 2 O 4 spinels with magnetic M ͑for which T C ϳ500-800 K 3 ͒ is due to the weak J B -B superexchange interactions between Fe sites, in contrast to the J A -B stronger interactions.…”