Temperature dependence of magnetic properties of zinc and niobium doped strontium hexaferrite nanoparticles

被引:36
作者
Fang, QQ [1 ]
Bao, HW [1 ]
Fang, DM [1 ]
Wang, JZ [1 ]
机构
[1] Anhui Univ, Dept Phys, Hefei 230039, Peoples R China
关键词
D O I
10.1063/1.1711158
中图分类号
O59 [应用物理学];
学科分类号
摘要
Zinc and niobium doped strontium hexaferrite nanoparticles, Sr(Zn0.7Nb0.3)(x)Fe12-xO19 (x=0-1.0), were fabricated using a sol-gel method for high density magnetic recording. The structure and temperature dependence of magnetic properties are investigated. The experiments show that strontium hexaferrite with small Zn and Nb substitutions still remains a hexagonal magnetoplumbite phase. The coercive force is reduced from 6.7 to about 2.3 kOe, while the values of saturation magnetization increased to 67-74 emu/g in the substitution range of x=0-1.0. This indicates that the saturation magnetization and coercivity of strontium hexaferrite nanoparticles can be held over a very wide range by an appropriate amount of Zn and Nb doping contents. Simultaneously, it is found that the doped strontium hexaferrite nanoparticles show a small positive temperature coefficient of coercivity. The substitution of Zn2+ and Nb4+ ions for Fe3+ ions also monitors the temperature dependence of magnetization and Curie temperature, and enhances thermal stability in the measured temperature range. This nanoparticle system is, thus, suitable for high-density recording. (C) 2004 American Institute of Physics.
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页码:6360 / 6363
页数:4
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