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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:320

Article

He, J. H.¹  Yuan, S. L.¹  Tian, Z. M.¹  Yin, Y. S.¹  Li, P.¹  Wang, Y. Q.¹  Liu, K. L.¹  Yuan, S. J.¹  Wang, X. L.¹  Liu, L.¹ 

[1] Huazhong Univ Sci & Technol, Dept Phys, Wuhan 430074, Peoples R China

关键词: Diluted magnetic semiconductor;    Chemical synthesis;    Ferromagnetism;    Exchange bias;    Magnetic measurement;   

DOI  :  10.1016/j.jmmm.2008.06.028

来源: Elsevier

【 摘 要 】

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% NiFe2O4 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 NiFe2O4 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 NiFe2O4 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. (C) 2008 Elsevier B.V. All rights reserved.

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