Precipitation of nanoscale Co particles in a granular Cu–Co alloy with giant magnetoresistance

详细信息    查看全文

• 作者：Yanga ; G.Y. ; Zhu ; Jing ; Wang ; W.D. ; Zhang ; Z. ; Zhu ; F.W.
• 关键词：A. Nanostructures ; C. Electron microscopy ; D. Magnetic properties ; D. Microstructure
• 刊名：Materials Research Bulletin
• 出版年：2000
• 出版时间：April 1, 2000
• 年：2000
• 卷：35
• 期：6
• 页码：875-885
• 全文大小：555 K

文摘

The precipitation of Co particles in the heterogeneous Cu₈₈Co₁₂ ribbon has been successfully investigated by using HRTEM and EDS. The presence of Co particles in Cu matrix was revealed by darker contrast in HRTEM image and the variations of chemical composition in the corresponding regions in the samples annealed at 450°C for different time. Longer annealing caused a coarsening and further gathering of the Co particles in the alloy. The comparison of GMR effect with the microstructural evolution of Cu₈₈Co₁₂ ribbon indicates that the size and the distribution of Co particles in Cu matrix play an important role in explaining GMR effect. Cu matrix and fcc Co precipitates have a cubic-cubic orientation relationship. The misfit of the lattice parameters between Cu matrix and Co precipitate was matched by the occurrence of interfacial dislocation and lattice distortion at the Cu/Co interface.