Magnetic properties in Fe-doped NiO synthesized by co-precipitation

The magnetic properties of 1.5 at% Fe-doped NiO bulk samples were investigated. The samples were prepared by sintering the corresponding precursor in air at temperatures between 400 and 800 °C for 6 h. The synthesis was by a chemical co-precipitation and post-thermal decomposition method. In order t...

Full description

Saved in:
Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2008-12, Vol.320 (23), p.3293-3296
Main Authors: He, J.H., Yuan, S.L., Tian, Z.M., Yin, Y.S., Li, P., Wang, Y.Q., Liu, K.L., Yuan, S.J., Wang, X.L., Liu, L.
Format: Article
Language:English
Subjects:
Chemical synthesis
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diluted magnetic semiconductor
Domain effects, magnetization curves, and hysteresis
Exact sciences and technology
Exchange bias
Ferromagnetism
Magnetic measurement
Magnetic properties and materials
Magnetic semiconductors
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Physics
Studies of specific magnetic materials
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The magnetic properties of 1.5 at% Fe-doped NiO bulk samples were investigated. The samples were prepared by sintering the corresponding precursor in air at temperatures between 400 and 800 °C for 6 h. The synthesis was by a chemical co-precipitation and post-thermal decomposition method. In order to allow a comparison, a NiO/0.76 at% NiFe 2O 4 mixture was also prepared. The X-ray diffraction pattern shows that the samples that were sintered at 400 and 600 °C remain single phase. As the sintering temperature increased to 800 °C, however, the sample becomes a mixture of NiO and NiFe 2O 4 ferrite phases. The samples were investigated by measuring their magnetization as a function of magnetic field. The samples sintered between 400 and 800 °C and the one mixed directly with NiFe 2O 4 nanoparticles show a coercivity value of H c≈200, 325, 350 and 110 Oe, respectively. The magnetic properties of the samples depend strongly on the sintering temperature. Simultaneously, the field-cooling hysteresis loop shift also observed after cooling the sample sintered at 600 °C to low temperature suggests the possibility of the existence of a ferromagnetic/antiferromagnetic exchange coupling.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2008.06.028