Cu-W thin film with high W content was deposited by dual-target DC-magnetron co-sputtering technology.Effects of the substrates surface treating technique on the adhesive strength of Cu-W thin films were studied.It is...Cu-W thin film with high W content was deposited by dual-target DC-magnetron co-sputtering technology.Effects of the substrates surface treating technique on the adhesive strength of Cu-W thin films were studied.It is found that the technique of ion beam assisting bombardment implanting of W particles can remarkably improve the adhesive property of Cu-W thin films. Indentation and scratching test show that,the critical load is doubled over than the sample only sputter-cleaned by ion beam.The enhancing mechanism of ion beam assisting bombardment implanting of Cu-W thin films was analyzed.With the help of mid-energy Ar+ion beam,W atoms can diffuse into the Fe-substrate surface layer;Fe atoms in the substrate surface layer and W atoms interlace with one another;and microcosmic mechanical meshing and diffusing combination on atom-scale among the Fe and W atoms through the film/substrate interface can be formed.The wettability and thermal expansion properties of the W atoms diffusion zone containing plentiful W atoms are close to those of pure W or W-based Cu-W film.展开更多
In this study, we have explored the ways to fabricate and optimize high-quality ultrathin YBa2 Cu3 O7-δ(YBCO) films grown on single-crystal(001) SrTiO3 substrates. Nearly atomic-flat YBCO films are obtained by pulsed...In this study, we have explored the ways to fabricate and optimize high-quality ultrathin YBa2 Cu3 O7-δ(YBCO) films grown on single-crystal(001) SrTiO3 substrates. Nearly atomic-flat YBCO films are obtained by pulsed laser deposition.Our result shows that the termination of SrTiO3 has only a negligible effect on the properties of YBCO. In contrast, we found that capping a non-superconducting oxide layer can generally enhance the superconductivity of YBCO. PrBa2 Cu3 O7,La2 CuO4, LaMnO3, SrTiO3, and LaAlO3 have been examined as capping layers, and the minimum thickness of superconducting YBCO with capping is ~ 2 unit cells–3 unit cells. This result might be useful in constructing good-performance YBCO-based field effect devices.展开更多
基金Project(05JJ3005)supported by the Natural Science Foundation of Hunan Province,China
文摘Cu-W thin film with high W content was deposited by dual-target DC-magnetron co-sputtering technology.Effects of the substrates surface treating technique on the adhesive strength of Cu-W thin films were studied.It is found that the technique of ion beam assisting bombardment implanting of W particles can remarkably improve the adhesive property of Cu-W thin films. Indentation and scratching test show that,the critical load is doubled over than the sample only sputter-cleaned by ion beam.The enhancing mechanism of ion beam assisting bombardment implanting of Cu-W thin films was analyzed.With the help of mid-energy Ar+ion beam,W atoms can diffuse into the Fe-substrate surface layer;Fe atoms in the substrate surface layer and W atoms interlace with one another;and microcosmic mechanical meshing and diffusing combination on atom-scale among the Fe and W atoms through the film/substrate interface can be formed.The wettability and thermal expansion properties of the W atoms diffusion zone containing plentiful W atoms are close to those of pure W or W-based Cu-W film.
基金Project supported by the National Key Research and Development Program of the Ministry of Science and Technology of China(Grants Nos.2017YFA0303002and 2016YFA0300204)the Fundamental Research Funds for the Central Universities,China
文摘In this study, we have explored the ways to fabricate and optimize high-quality ultrathin YBa2 Cu3 O7-δ(YBCO) films grown on single-crystal(001) SrTiO3 substrates. Nearly atomic-flat YBCO films are obtained by pulsed laser deposition.Our result shows that the termination of SrTiO3 has only a negligible effect on the properties of YBCO. In contrast, we found that capping a non-superconducting oxide layer can generally enhance the superconductivity of YBCO. PrBa2 Cu3 O7,La2 CuO4, LaMnO3, SrTiO3, and LaAlO3 have been examined as capping layers, and the minimum thickness of superconducting YBCO with capping is ~ 2 unit cells–3 unit cells. This result might be useful in constructing good-performance YBCO-based field effect devices.
