This paper presents high quality YBa_(2)Cu_(3)O_(7-δ)(YBCO)thin films on LaAlO_(3)substrate for microwave devices prepared by pulsed laser deposition(PLD).The double-sided YBCO films cover a large area and have been ...This paper presents high quality YBa_(2)Cu_(3)O_(7-δ)(YBCO)thin films on LaAlO_(3)substrate for microwave devices prepared by pulsed laser deposition(PLD).The double-sided YBCO films cover a large area and have been optimized for key parameters relevant to microwave device applications,such as surface morphology and surface resistance(R_(s)).This was achieved by improving the target quality and increasing the oxygen pressure during deposition,respectively.To evaluate the suitability of the YBCO films for microwave devices,a pair of microwave filters based on microstrip fabricated on films from this work and a commercial company were compared.The results show that the YBCO films in this work could completely meet the requirements for microwave devices.展开更多
Textured Bi and MnBi/Bi thin films are prepared by the pulsed laser deposition method. The highly c-axis textured MnBi films are obtained by annealing the bilayer consisting of textured Bi and Mn films. The eoerciviti...Textured Bi and MnBi/Bi thin films are prepared by the pulsed laser deposition method. The highly c-axis textured MnBi films are obtained by annealing the bilayer consisting of textured Bi and Mn films. The eoercivities of the MnBi/Bi film are 1.5 T and 2.35 T at room temperature and at 373K, respectively, showing a positive temperature coefficient. Microstructural investigations show that the textured MnBi film results from the orientated growth induced by the textured Bi under-layer.展开更多
The surface morphology of buffer layer yttrium-stabilized zirconia （YSZ） of YBa2CuaO7-σ （YBCO） high temperature superconducting films relies on a series of controllable experimental parameters. In this work, we f...The surface morphology of buffer layer yttrium-stabilized zirconia （YSZ） of YBa2CuaO7-σ （YBCO） high temperature superconducting films relies on a series of controllable experimental parameters. In this work, we focus on the influence of pulsed laser frequency and target crystalline type on surface morphology of YSZ films deposited by pulsed laser deposition （PLD） on rolling assisted biaxially textured substrate tapes. Usually two kinds of particles are observed in the YSZ layer： randomly distributed ones on the whole film and self-assembled ones along grain boundaries. SEM images are used to prove that particles can be partly removed when choosing dense targets of single crystalline. Lower frequency of pulsed laser also contributes to a smoother film surface. TEM images are used to view the crystalline structure of thin film. Thus we can obtain a basic understanding of how to prepare a particle-free YSZ buffer layer for YBCO in optimized conditions using PLD. The YBCO layer with nice structure and critical current density of around 5 MA/cm2 can be reached on smooth YSZ samples.展开更多
利用 X 射线衍射(XRD),X 射线摇摆曲线(XRC)和 X 射线光电子能谱(XPS)分析方法对氧离子束辅助激光淀积生长的 ZnO/Si 异质结薄膜进行了分析。结果表明:用该法可生长出高度 c 轴单一取向 ZnO 薄膜,XRC 的半高宽度(FWHM)仅为2.918°...利用 X 射线衍射(XRD),X 射线摇摆曲线(XRC)和 X 射线光电子能谱(XPS)分析方法对氧离子束辅助激光淀积生长的 ZnO/Si 异质结薄膜进行了分析。结果表明:用该法可生长出高度 c 轴单一取向 ZnO 薄膜,XRC 的半高宽度(FWHM)仅为2.918°。表明此生长方法经优化,可生长出单晶质量很好的 ZnO/Si 薄膜。展开更多
基金Project supported by the National Key Basic Research Program of China(Grant Nos.2022YFA1603903 and 2021YFA0718700)the Key-Area Research and Development Program of Guangdong Province,China(Grant No.2020B0101340002)+3 种基金the National Natural Science Foundation of China(Grant Nos.61971415,51972012,11927808,119611410,11961141008,and 12274439)the Strategic Priority Research Program(B)of Chinese Academy of Sciences(Grant No.XDB25000000)Beijing Natural Science Foundation(Grant No.Z190008)Basic Research Youth Team of Chinese Academy of Sciences(Grant No.2022YSBR-048).
文摘This paper presents high quality YBa_(2)Cu_(3)O_(7-δ)(YBCO)thin films on LaAlO_(3)substrate for microwave devices prepared by pulsed laser deposition(PLD).The double-sided YBCO films cover a large area and have been optimized for key parameters relevant to microwave device applications,such as surface morphology and surface resistance(R_(s)).This was achieved by improving the target quality and increasing the oxygen pressure during deposition,respectively.To evaluate the suitability of the YBCO films for microwave devices,a pair of microwave filters based on microstrip fabricated on films from this work and a commercial company were compared.The results show that the YBCO films in this work could completely meet the requirements for microwave devices.
基金Supported by the National Natural Science Foundation of China under Grant Nos 51171001,51371009 and 50971003the Foundation of Key Laboratory of Neutron Physics of CAEP under Grant No 2014BB02
文摘Textured Bi and MnBi/Bi thin films are prepared by the pulsed laser deposition method. The highly c-axis textured MnBi films are obtained by annealing the bilayer consisting of textured Bi and Mn films. The eoercivities of the MnBi/Bi film are 1.5 T and 2.35 T at room temperature and at 373K, respectively, showing a positive temperature coefficient. Microstructural investigations show that the textured MnBi film results from the orientated growth induced by the textured Bi under-layer.
基金Supported by the ITER Project of the Ministry of Science and Technology of China under Grant No 2011GB113004the Shanghai Commission of Science and Technology under Grant No 11DZ1100402the Youth Fund of the National Natural Science Foundation of China under Grant No 11204174
文摘The surface morphology of buffer layer yttrium-stabilized zirconia （YSZ） of YBa2CuaO7-σ （YBCO） high temperature superconducting films relies on a series of controllable experimental parameters. In this work, we focus on the influence of pulsed laser frequency and target crystalline type on surface morphology of YSZ films deposited by pulsed laser deposition （PLD） on rolling assisted biaxially textured substrate tapes. Usually two kinds of particles are observed in the YSZ layer： randomly distributed ones on the whole film and self-assembled ones along grain boundaries. SEM images are used to prove that particles can be partly removed when choosing dense targets of single crystalline. Lower frequency of pulsed laser also contributes to a smoother film surface. TEM images are used to view the crystalline structure of thin film. Thus we can obtain a basic understanding of how to prepare a particle-free YSZ buffer layer for YBCO in optimized conditions using PLD. The YBCO layer with nice structure and critical current density of around 5 MA/cm2 can be reached on smooth YSZ samples.
文摘利用 X 射线衍射(XRD),X 射线摇摆曲线(XRC)和 X 射线光电子能谱(XPS)分析方法对氧离子束辅助激光淀积生长的 ZnO/Si 异质结薄膜进行了分析。结果表明:用该法可生长出高度 c 轴单一取向 ZnO 薄膜,XRC 的半高宽度(FWHM)仅为2.918°。表明此生长方法经优化,可生长出单晶质量很好的 ZnO/Si 薄膜。
