Effect of Surface Modifications on the Magnetic Properties of Ni0.5Zn0.5Fe2O4 Nanoparticles

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (6): 547-551.

• Nanomaterials and Nanotechnology • Previous Articles Next Articles

Effect of Surface Modifications on the Magnetic Properties of Ni_0.5Zn_0.5Fe₂O₄ Nanoparticles

Wei Zhang, Hongxia Wang, Faling Zhang, Zhengnan Qian, Wenhui Su

1) School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
2) Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China
3) Department of Chemistry, Harbin Normal University, Harbin 150001, China
4) Department of Physics, Jiangsu University, Zhenjiang 212013, China

Received:2009-01-12 Revised:2010-01-04 Online:2010-06-22 Published:2010-06-22
Contact: Zhang Wei
Supported by:
the National Natural Science Foundation of China (Grant No. 10304004)

Abstract

Abstract:

Two different silica sources have been used for the preparation of Ni_0.5Zn_0.5Fe₂O₄ /SiO₂ nanocomposites, and their effects on the particle size, crystallinity and the magnetic properties have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM) and physical property measurement system (PPMS). In both cases, Ni_0.5Zn_0.5Fe₂O₄ nanoparticles of 11 nm in mean particle size were well dispersed in silica matrix. The coercivity and the blocking temperature of Ni_0.5Zn_0.5Fe₂O₄ nanoparticles modified with the silicon coupling agent show little decrease, whereas the saturation magnetization increases obviously with respect to nanoparticles dispersed directly in silica matrix. It is considered that the decrease of the surface anisotropy resulting from the change in the surface coordination is responsible for the observed behavior.

Key words: Chemical synthesis, Silica, Magnetic properties, Ferrites

Wei Zhang Hongxia Wang Faling Zhang Zhengnan Qian Wenhui Su. Effect of Surface Modifications on the Magnetic Properties of Ni_0.5Zn_0.5Fe₂O₄ Nanoparticles[J]. J Mater Sci Technol, 2010, 26(6): 547-551.

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Effect of Surface Modifications on the Magnetic Properties of Ni_0.5Zn_0.5Fe₂O₄ Nanoparticles

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