부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.physb.2006.02.017 Byline: Y.K. An (a), H.D. Zhang (a), Z.H. Mai (a), B. Dai (a), J.W. Cai (a), Z.H. Wu (b), H.T. Zhou (b), T. Liu (b) Keywords: X-ray reflection anomalous fine structure; X-ray absorption spectroscopy; Surfactant; Silver; Multilayer Abstract: We performed X-ray reflection anomalous fine structure and X-ray absorption spectroscopy measurements to investigate the influence of Ag as a surfactant on the annealing Ni.sub.70Co.sub.30/Cu multilayer for the first time. Interfacial intermixing and silver diffusion levels were quantified at the atomic level. During the deposition, a 6A thick intermixing region exists at the Cu/Ni.sub.70Co.sub.30 interface while the Ni.sub.70Co.sub.30/Cu interface is sharp for the un-doped and the Ag-doped multilayers. After 285[degrees]C annealing, the two multilayers display different thermal behaviors. Severe diffusion occurs at the Cu/Ni.sub.70Co.sub.30 and Ni.sub.70Co.sub.30/Cu interfaces of the un-doped multilayer. However, of these the Ag-doped multilayer do not change significantly, indicating that the addition of silver can suppress interfacial intermixing after annealing. The Ag atoms in the Ag-doped multilayer have diffused into some parts of Ni.sub.70Co.sub.30 layer while do not exist at the interfaces during the deposition. After 285[degrees]C annealing, the Ag atoms diffused into the whole Ni.sub.70Co.sub.30 layer as well as some parts of the Cu layer. The X-ray absorption spectroscopy measures show that Ni atoms and Cu atoms occupy the interfacial positions in the un-doped multilayer. The addition of silver also do not change the FCC lattice of Co, Ni and Cu, but decrease the amplitude of the Ni and the Co K edge EXAFS profiles, suggesting that Ag atoms do diffuse into the Ni.sub.70Co.sub.30 layer. Author Affiliation: (a) Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PR China (b) Beijing Synchrotron Radiation Facility (BSRF), Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, PR China Article History: Received 24 January 2006; Revised 20 February 2006; Accepted 22 February 2006