Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

1 Publication
Inverse spinel ZnFe2O4 nanoparticles synthesized by ion implantation and post-annealing: an investigation using X-ray spectroscopy and magneto-transport
Zhou, S.; Potzger, K.; Buerger, D.; Kuepper, K.; Helm, M.; Fassbender, J.ORC; Schmidt, H.
Noncrystalline ZnFe2O4 has been investigated intensively due to the drastic difference in cation distribution compared with bulk materials. We previously synthesized ZnFe2O4 nanoparticles by ion implantation and post-annealing [J. Phys. D-Appl. Phys. 40, (2007) 964]. These ZnFe2O4 nanocrystals are crystallographically oriented inside the ZnO matrix and show a hysteretic behavior upon magnetization reversal at 5 K. Their magnetic properties are explained by assuming that Fe^{3+} ions partially occupy tetrahedral sites. In this paper an X-ray spectroscopic and magneto-transport investigation on ZnFe2O4 nanocrystals in a ZnO matrix will be presented. The occupation of Fe^{3+} at tetrahedral sites has been directly proved. A positive magnetoresistance (MR) effect is observed and is attributed to ordinary MR.
Keywords: ZnFe2O4, X-ray absorption, Magnetoresistance

Publ.-Id: 11874 - Permalink