表面科学
Online ISSN : 1881-4743
Print ISSN : 0388-5321
ISSN-L : 0388-5321
最新号
選択された号の論文の13件中1~13を表示しています
会告
巻頭言
特集: 酸化物表面・界面における制御された新奇電子状態とその構造
  • 組頭 広志
    原稿種別: 研究紹介
    2017 年 38 巻 12 号 p. 596-601
    発行日: 2017/12/10
    公開日: 2017/12/21
    ジャーナル フリー
    The quantum confinement of strongly correlated electrons in artificial structures has heralded the possibility of creating the novel quantum materials with extraordinary physical properties. By optimally combining sophisticated oxide growth techniques and advanced analysis techniques using synchrotron radiation, we have designed and controlled the novel quantum phenomena emerging in oxide artificial structures. The observed metallic quantum-well states in digitally controlled ultrathin films of strongly correlated oxide SrVO3 exhibit characteristic features reflecting their strongly correlated nature. Furthermore, the structural controllability of the quantum-well structures enables us to investigate how the electronic structure changes as a function of dimensionality. The present study demonstrates that the quantum-well structure of strongly correlated oxides will provide a new strategy for both investigating the behavior of correlated electrons under varying interactions among their spin, charge, and orbital degrees of freedom and for manipulating novel quantum phenomena in reduced dimensions.
  • 和達 大樹, 山本 航平
    原稿種別: 研究紹介
    2017 年 38 巻 12 号 p. 602-607
    発行日: 2017/12/10
    公開日: 2017/12/21
    ジャーナル フリー

    Observing ordered states in transition-metal oxides has been one of the most important topics in contemporary condensed-matter physics because ordering phenomena is directly related to anomalous physical properties such as superconductivity, colossal magnetoresistance, multiferroicity, and metal-insulator transition. Resonant soft x-ray diffraction has emerged as a new experimental tool for investigating spin ordering, and is especially suitable for studying thin films. Here we show how we have successfully observed charge/spin ordered states in transition-metal-oxide thin films by combining hard and soft x-ray diffraction.

  • 浅川 寛太, 河内 泰三, 福谷 克之
    原稿種別: 研究紹介
    2017 年 38 巻 12 号 p. 608-613
    発行日: 2017/12/10
    公開日: 2017/12/21
    ジャーナル フリー

    The magnetic and electronic structures of the Fe3O4(111) surface were investigated by conversion electron Mössbauer spectroscopy (CEMS) and ultraviolet photoemission spectroscopy (UPS), respectively. The CEMS results indicated that the Fe3O4(111) surface is covered by closure domains, and that the magnetization direction of the Fe(B) site is more parallel to the surface than the non-perpendicular easy axes while that of the Fe(A) site corresponds to the easy exes. This indicates that the spins of the Fe(A) and Fe(B) sites are non-collinear near the surface. By using UPS, we have discovered that the H atom adsorption on the Fe(A)-terminated Fe3O4(111) surface reduces the work function but does not induce charge transfer. On the O2-exposed Fe(A)-terminated Fe3O4(111) surface, on the other hand, H adsorption increases the Fe(B) t2g derived peak in the UPS spectrum and decreases the work function. This indicates that, on the O2-exposed Fe(A)-terminated Fe3O4(111) surface, H atoms adsorb as cations and dope electrons to the Fe(B) t2g orbital.

  • 松野 丈夫
    原稿種別: 研究紹介
    2017 年 38 巻 12 号 p. 614-619
    発行日: 2017/12/10
    公開日: 2017/12/21
    ジャーナル フリー
    Spin-orbit interaction in solids can be utilized for controlling spin-dependent transport phenomena. To realize them, we focus on thin films and interfaces of iridium (Ir) oxides since electron conduction there is dominated by 5d electrons with strong spin-orbit interaction. The first example is the inverse spin Hall effect, which converts a spin current into an electric voltage. The performance of IrO2 as a spin-current detector is better than those of noble metals. The second is the topological Hall effect originating from magnetic skyrmions. The epitaxial bilayers consisting of SrRuO3 and SrIrO3 enable us to generate skyrmions through artificially broken inversion symmetry at the interfaces. These results can be a step toward future spintronics.
    Editor’s picks

  • 白澤 徹郎, Wolfgang VOEGELI, 荒川 悦雄, 亀沢 知夏, 高橋 敏男, 松下 正
    原稿種別: 研究紹介
    2017 年 38 巻 12 号 p. 620-625
    発行日: 2017/12/10
    公開日: 2017/12/21
    ジャーナル フリー

    A hydrophobic TiO2 surface can be converted to a hydrophilic one by UV light irradiation. This phenomenon was discovered more than 20 years ago and has been used in a variety of coating applications. However, the mechanism is not well understood. In particular, it is still not clear whether and how the surface structure is involved. We studied the possible structural change of the rutile-TiO2(110) surface by using X-ray crystal truncation rod (CTR) scattering. We demonstrated the occurrence of a surface structural change during the photoirradiation by using the high-speed CTR scattering profile measurement in a wavelength dispersive mode. We determined the structure of the hydrophobic (non-irradiated) and hydrophilic (photoirradiated) surfaces based on static CTR data, and proposed a possible mechanism of the water wettability transition.

  • 平山 雅章
    原稿種別: 研究紹介
    2017 年 38 巻 12 号 p. 626-631
    発行日: 2017/12/10
    公開日: 2017/12/21
    ジャーナル フリー

    Gaining a thorough understanding of the electrochemical interface in lithium ion batteries is essential for the development of a common strategy for the material design. This paper presents the interfacial reaction analyses between intercalation electrodes and organic electrolytes using an epitaxial-film model electrode and in situ surface scattering techniques which directly detect crystal structures in 10 nm-regions from the top of the electrode surface. The crystal structures of the intercalation electrodes drastically change in the surface regions when soaked to the electrolyte and are reconstructed during the initial electrochemical reaction. The reconstructed surface regions have a pronounced effect on the power characteristics and the stability at the subsequent electrochemical cycles.

連載企画
伝統産業と表面科学
  • 濱田 泰以
    2017 年 38 巻 12 号 p. 632-634
    発行日: 2017/12/10
    公開日: 2017/12/21
    ジャーナル フリー
    伝統産業は長年の我々の先人達が作り上げてきた知の結晶である。製品よりもそのものづくりの過程に多くの知恵が塗り重ねられている。伝統産業工学は総合工学であり,材料から始まり,成形,構造,その物性,さらにその機能を研究していくものである。それらを踏まえて感性,人に愛される製品に結び付くことになる。ものづくりの暗黙知を形式知化することが伝統産業工学の目的である。この手法は,介護や看護,さらに技能が卓越した産業界に十分に応用可能である。得られた成果を教育などに還元,展開していくのが伝統みらい学である。伝統の匠たちの技能から端を発した学問が,大きく羽ばたいていこうとしている。
談話室
海外研究体験記
先端追跡
小特集
  • 森田 清三, 荻野 俊郎, 菅野 卓雄, 平山 博之, 塚田 捷, 尾嶋 正治, 吉原 一紘, 大島 忠平, 宮崎 栄三, 重川 秀実, 高 ...
    2017 年 38 巻 12 号 p. 638-649
    発行日: 2017/12/10
    公開日: 2017/12/21
    ジャーナル フリー
     公益社団法人表面科学会と一般社団法人真空学会の合併に先駆け,表面科学誌は次号よりJournal of Vacuum Society Japan誌と統合され,Vacuum and Surface Science(表面と真空)誌として新しく生まれ変わります。これを機に表面科学誌の発展に多大なる貢献をされてきました歴代編集長および会長を務められてきた先生に様々な立場や時代における表面科学誌への想い,新創刊誌にかける期待,近況などについて自由に述べていただく場を設けさせていただきました。
談話室(拡大編集後記)
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