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

作者：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

来源：Journal of Magnetism and Magnetic Materials, 2008, 320(23): 3293-3296.

DOI：10.1016/j.jmmm.2008.06.028

• Diluted magnetic semiconductor
• Chemical synthesis
• Ferromagnetism
• Exchange bias
• Magnetic measurement

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 degrees 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(2)O(4) mixture was also prepared. The X-ray diffraction pattern shows that the samples that were sintered at 400 and 600 degrees C remain single phase. As the sintering temperature increased to 800 degrees C, however, the sample becomes a mixture of NiO and NiFe(2)O(4) ferrite phases. The samples were investigated by measuring their magnetization as a function of magnetic field. The samples sintered between 400 and 800 degrees C and the one mixed directly with NiFe(2)O(4) nanoparticles show a coercivity value of H(c)approximate to 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 degrees C to low temperature suggests the possibility of the existence of a ferromagnetic/antiferromagnetic exchange coupling.

• 出版日期2008-12
• 单位华中科技大学