Magnetic properties of Bi-doped Y₃Fe₅O₁₂ nanoparticles

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• 作者：Haitao Xu ; Hua Yang ; Wei Xu ; Lianxiang Yu
• 关键词：Yttrium iron garnet ; Bi³⁺ ; Magnetic ; Ferrite
• 刊名：Current Applied Physics
• 出版年：2008
• 出版时间：January 2008
• 年：2008
• 卷：8
• 期：1
• 页码：1-5
• 全文大小：649 K

文摘

Bi³⁺ substituted garnet nanoparticles Y_3−xBi_xFe₅O₁₂ (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2 and 1.3) were fabricated by a sol–gel method and their crystalline structures and magnetic properties were investigated by using X-ray diffraction (XRD), IR spectroscopy, thermal gravity analysis–differential thermal analysis (TG-DTA), transmission electron microscope (TEM), Mössbauer spectroscopy and vibrating sample magnetometer (VSM). The XRD patterns of Y_3−xBi_xFe₅O₁₂ have only peaks of the garnet structure. From the results of VSM, it is shown that the saturation magnetization of sample is decreased with increasing the content of Bi ions. Meanwhile, it is observed that with the enhancement of the single magnetic domains surface spin effects, the saturation magnetization is raised as the particle size of samples is increased.