Double Layered Thin Film Fabrication of a/c-controlled YBCO and Manganites, and Tunable Microwave Filters

交流控制 YBCO 和锰氧化物的双层薄膜制造以及可调谐微波滤波器

• 批准号: 15560006
• 负责人: ENDO Tamio
• 金额: $ 2.05万
• 依托单位: Mie University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560006/
• 关键词: Tunable microwave filters; HTS YBCO thin films; Ferromagnetic LBMO. LSMO films; Ion Beam Sputtering; YBCO; LBMO double layers; Microwave absorption; Degradations under double-layers depositions; Superlattice LCMO; ナノ材料; 超伝導材料; 積層薄膜; 複合材料・物性

Double layers of Ferromagnetic/Hi-Tc-Superconductors (HTS) can be used for tunable microwave filters at base stations of mobile phone system. Permeability of Ferro-layer is modified by magnetic field, leading to modification of microwave propagation on HTS-layer. It is necessary to obtain single-layers and double-layers which complete such functions. Further, it is important to elucidate microwave absorption (MA) in HTS under magnetic field (H), problems of deteriorations under the double layers depositions and elapsed-degradations of thin films in application periods. In this project, we studied [1] thin film growths of Ferro-LSMO and-LBMO single layers, [2] double layer depositions of LSMO/YBCO and LBMO/YBCO (YBCO: HTS-layer), and their degradations, [3] microwave absorptions in HTS-YBCO and Superlattices under magnetic field.YBCO thin films were deposited on Mg0 and LAO substrates by Ion Beam Sputtering (IBS) with oxygen plasma supply. We succeeded to grow them at ultra-low temperat … More ures and obtained extremely smooth films. We could control a/c-orientation growths completely and elucidated a mechanism of a/c-orientations <surface migration>. Fine crystalline LSMO and LBMO thin films could be grown at ultra-low temperatures. LSMO showed 2D step-terrace growth mode. LSMO over-layers could be grown on a-YBCO under-layers but a part of a-YBCO was changed into c-YBCO. High quality YBCO over-layers could be grown on LBMO under-layers. During the double-layer depositions, the crystallinity of under-LBMO was not degraded but the double-layer surface was much roughened. The surface was very smooth when LBMO was deposited on YBCO layers but under-YBCO was degraded during the double-layer depositions. The crystallinity showed large elapsed-degradations for a few years for a-YBCO/Mg0 but not for a-YBCO/LAO. It was known that the degradation is concerned with lattice matching.High Tc (86 K) a-YBCO and c-YBCO were fabricated by PLD, and their MA was investigated under H. MA was larger for c-YBCO than for a-YBCO. MA was smaller for H//a than for H//c then it was clarified that a-YBCO is more useful for the double-layered tunable microwave filters. It was elucidated by theoretical analysis that an <excess screening current mechanism> is a major factor for MA. We measured MA on LCMO/YBCO superlattice, and found a quite important fact that MA is large for H perpendicular to the plane but negligible small for H parallel to the plane. Thus we could propose that we can minimize the microwave absorption in HTS-layers for the parallel magnetic field when the Ferro/HTS double-layers (superlattices) will be used for tunable microwave filters in the near future. Less

铁磁/HI-TC-Superconductors（HTS）的双层可用于手机系统基础电台的可调微波过滤器。铁层的渗透性通过磁场修饰，从而改变了HTS层上微波传播。有必要获得完成此类功能的单层和双层。此外，重要的是要在磁场（H）下阐明HTS中的微波受苦（MA），双层沉积下的恶化问题以及在施用周期中薄膜的降解。 In this project, we studied [1] thin film growths of Ferro-LSMO and-LBMO single layers, [2] double layer depositions of LSMO/YBCO and LBMO/YBCO (YBCO: HTS-layer), and their degradations, [3] microwave abuses in HTS-YBCO and Superlattices under magnetic field.YBCO thin films were deposited on Mg0 and LAO带有氧血浆供应的离子束溅射（IB）的底物。我们成功地在超低温度下将它们种植……更多的ures并获得了极其光滑的膜。我们可以完全控制A/C面向A/C的增长，并阐明了A/C面向<surance迁移>的机制。精细的结晶LSMO和LBMO薄膜可以在超低温度下生长。 LSMO显示了2D步骤生长模式。 LSMO层面可以在A-YBCO下层的级别上生长，但A-Ybco的一部分已更改为cybco。高质量的YBCO层可以在LBMO下层层上种植。在双层沉积期间，LBMO下的结晶度没有降解，但双层表面被大大粗糙。当LBMO沉积在YBCO层上时，表面非常光滑，但在双层沉积期间降解了Yb​​co。结晶度显示出大量的降解数年，用于a-ybco/mg0，但没有a-ybco/lao。众所周知，降解与晶格匹配有关。高高的TC（86 K）a-ybco和c-Ybco是由PLD制造的，并且在H. MA下对MA进行了调查。c-Ybco的MA大于A-YBCO。对于H // a，MA比对于H // C小，然后澄清，通过理论分析阐明了A-YBCO，<多余的筛选电流机制>是MA的主要因素。我们在LCMO/YBCO超晶格上测量了MA，发现一个非常重要的事实，即垂直于平面的H较大，但对于平行于平面的h而言，Ma很小。我们可以提出，当Ferro/HTS双层层（超晶格）将在不久的将来使用可调微波炉过滤器时，我们可以将平行磁场中HTS层中的微波滥用最小化。较少的

项目成果

Temperature Dependence of Microwave Absorption in Bi2212 Single Crystal

Bi2212 单晶微波吸收的温度依赖性

• 发表时间: 2006
• 期刊: Progress in Electromagnetics Research Symposium 2006 (Tokyo, Japan)
• 作者: Hirokazu 0-oka;Ajay K.Sarkar;Atsushi Kamiya;Ken-ichi Nakanishi;Tamio Endo;Md.Shahabuddin
• 通讯作者: Md.Shahabuddin

Electrical and Magnetic Properties, and Phase Separation of LBMO Thin Films

LBMO 薄膜的电学、磁学性质以及相分离

• 发表时间: 2005
• 期刊: International Conference on Materials for Advanced Technologies / International Conference on Advanced Materials, (2005/7/3-8),Singapore, <Invited Lecture>
• 作者: Tamio Endo;Hidetaka Nakashima;Michi Ogata;Atsuya Akiba;Hong Zhu;Kazuhiro Endo
• 通讯作者: Kazuhiro Endo

Effects of Substrate Surface Exposure to Oxygen-Plasma on a-c Orientation Growth of YBCO : Verification of Surface Migration Mechanism <Invited Talk>

基板表面暴露于氧等离子体对YBCO a-c取向生长的影响：表面迁移机制的验证<邀请报告>

• 发表时间: 2006
• 期刊: International Conference on Solid Films and Surfaces 2006 (Bariloche)
• 作者: Tamio Endo;Hong Zhu;et al.
• 通讯作者: et al.

LSMO Thin Film Preparation by Ion Beam Sputtering, and Step and Terrace Surface

离子束溅射制备 LSMO 薄膜以及台阶和平台表面

• 发表时间: 2004
• 期刊: International Workshop on Inelastic Ion-Surface Collisions, (2004/10/17-22),Ise-Shima, Japan
• 作者: Michi Ogata;Hidetaka Nakashima;Atsuya Akiba;Tamio Endo
• 通讯作者: Tamio Endo

Tamio Endo: "Low Temperature Growths of Perovskite Oxide Thin Films and Nano-Multilayers by IBS"IUMRS-ICAM2003 Int.Conf.Abstract. A/B(招待). 225 (2003)

Tamio Endo：“IBS 的钙钛矿氧化物薄膜和纳米多层的低温生长”IUMRS-ICAM2003 Int.Conf.A/B（邀请）。