Structural and magnetic properties of Cu₈₀Fe₅Ni₁₅ granular ribbons

详细信息    查看全文

• 作者：S. Cazottes ; A. Fnidiki ; D. Lemarch ; F. Danoix ; P. Ochin
• 关键词：Cu– ; Fe– ; Ni system ; Superparamagnetic particle ; Magnetization
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2007
• 出版时间：September 2007
• 年：2007
• 卷：316
• 期：2
• 页码：e760-e763
• 全文大小：178 K

文摘

Microstructure and magnetic properties of as-quenched melt-spun Cu₈₀Fe₅Ni₁₅ ribbon have been studied. The microstructure was investigated with X-ray diffraction and transmission electron microscopy (TEM). Magnetization measurements, Mössbauer spectrometry has been used in order to determine the magnetic properties. The microstructure of the ribbon is compatible with the presence of two spinodally decomposed FCC phases: a Cu-rich and a (Fe,Ni)-rich phase. The Mössbauer spectrum was well adjusted with two contributions: one from the Cu-rich phase and the other from the (Fe,Ni)-rich phase. From Mössbauer and ZFC/FC measurements, the ribbon shows a superparamagnetic behavior at 300 K, and a Super Spin Glass behavior below T_g=20 K. Fitting the magnetization curves provided a medium size of the magnetic particles diameter of 3.1 nm, with the maximum magnetic particle diameter calculated from ZFC/FC curve of 11 nm. Finally, magnetoresistance curves show no hysteresis, and the values measured were 15 % at 5 K and 0.2 % at 300 K for a maximum applied field of 50 kOe.