Thermally driven shape instabilities of Nb/Cu multilayer structures: instability of Nb/Cu multilayers
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- 作者：Troche ; Peter ; Hoffmann ; Jö ; rg ; Heinemann ; Klaus ; Hartung ; Frank ; Schmitz ; Guido ; Freyhardt ; Herbert C. ; et. al.
- 关键词：Niobium. Copper ; Multilayers ; Shape instability
- 刊名：Thin Solid Films
- 出版年：1999
- 出版时间：September 29, 1999
- 年：1999
- 卷：353
- 期：1-2
- 页码：33-39
- 全文大小：165 K
文摘
The disintegration of Nb layers in Nb/Cu multilayers during heat treatments was investigated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray microscopy (XRM). Spherically shaped Nb particles were observed after a heat treatment at 870K for 3h. The growth velocity of the Nb particles depends strongly on the initial interface roughness and the Nb layer thickness. The XRM investigations indicate a process of self-assembly, leading to a non-statistical distribution of the particles. Measurements of the superconducting properties of both annealed and non-annealed samples, confirm the microstructural observations.