Magnetic properties of Co-Cu metastable solid solution alloys
Magnetic properties of Co-Cu metastable solid solution alloys
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DOI：
10.1103/physrevb.69.094432
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发表时间：
2004-03
影响因子：
3.7
通讯作者：
Xu Fan;T. Mashimo;Xinsheng Huang;T. Kagayama;A. Chiba;K. Koyama;M. Motokawa
中科院分区：
文献类型：
--
作者：
Xu Fan;T. Mashimo;Xinsheng Huang;T. Kagayama;A. Chiba;K. Koyama;M. Motokawa
采用机械合金化和冲击压缩相结合的方法制备了Co（10-90 mol % Co）-Cu（10-90 mol % Co）亚稳固溶体合金粉末和块体合金。所有MA处理的粉末的X-射线衍射图显示的fcc结构的单相。晶格常数随Cu含量的增加而增大，基本符合Vegard定律。CoxCu 100- x（x = 20 ~ 80）亚稳块体合金的室温磁化曲线为铁磁性，而Co 10 Cu 90亚稳块体合金的室温磁化曲线为顺磁性。在0 K时，饱和磁矩（MS）随每个原子电子数的变化曲线与其它过渡金属二元系的Slater Pauling曲线相似，随Cu浓度的增加而减小，在28.8个电子/原子时趋于零.在铁磁区，室温磁电阻率随Cu含量的增加而增加，而顺磁Co 10 Cu 90合金的室温磁电阻率很小。
Metastable solid solution alloy powders and bulk alloys in the cobalt(Co)-copper(Cu) (10-90 mol % Co) system, which is an almost immiscible system at the ambient state, were prepared by mechanical alloying (MA) and shock compression. All MA-treated powders showed the x-ray diffraction patterns of a single phase of fcc structure. The lattice parameter increases with Cu concentration and is fundamentally on the line with Vegard's law. The magnetization curves of Co x Cu 1 0 0 - x (x = 20- 80) metastable bulk alloys at room temperature showed ferromagnetism, while the one of Co 1 0 Cu 9 0 system showed paramagnetism. The saturation magnetic moment (M S ) curve versus electron numbers per atom at 0 K was found to be similar to the Slater-Pauling curves of other transition-metal binary systems and decreased with increasing Cu concentration and approached zero at about 28.8 electrons per atom. The magnetoresistance ratio at room temperature increased with Cu content in the ferromagnetic region, while the one of the paramagnetic Co 1 0 Cu 9 0 alloy was negligibly small.