Investigating the magnetic properties of soft magnetic composites based on mechanically alloyed nanocrystalline Fe–5 wt % Ni powders

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• 作者：Amir Hossein Taghvaei ; Azadeh Ebrahimi ; Mohammad Ghaffari ; Kamal Janghorban
• 关键词：Mechanical alloying ; Magnetic measurement ; X-ray diffraction
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：323
• 期：1
• 页码：149-155
• 全文大小：695 K

文摘

In this work, the soft magnetic composites (SMCs) of the nanocrystalline Fe–5 wt % Ni powders coated with phenolic resin were studied. The nanocrystalline powders with an average diameter of 10 nm were obtained by mechanical alloying up to 96 h milling in a high-energy planetary ball mill. The microstructure and magnetic properties of the milled powders were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy and a vibrating sample magnetometer. The results of X-ray diffraction showed that the bcc Fe(Ni) solid solution is formed after 24 h milling. Magnetic measurements indicated that the 96 h milled powders with a steady-state grain size of 10 nm have the highest saturation magnetization and the lowest coercivity. The SMCs based on nanocrystalline powders showed higher electrical resistivity and magnetic permeability up to 1 MHz, as compared with the pure iron-based composites. Besides, the nanocrystalline-based SMCs exhibited higher relaxation frequency and a significantly lower loss factor up to 1 MHz.