著者

小倉 正平

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.57, no.6, pp.219-226, 2014 (Released:2014-06-25)

参考文献数

40

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Thermal desorption spectroscopy (TDS) is an important technique for investigation of adsorption, absorption, and desorption behaviors of atoms and molecules on surfaces. We briefly summarize the general procedure of TDS in surface science studies, and then we introduce our recent study of hydrogen transport across a Pd-Au alloy surface measured by TDS as an example. By combining the TDS data with other surface analysis, we found that hydrogen penetrates and desorbs through a site related to surface Pd atoms. We also demonstrate a molecular cap effect of CO, where a small amount of CO adsorption greatly changes the hydrogen absorption and desorption behavior by blocking the entrance and exit site.

著者

林 主税

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.52, no.6, pp.303-312, 2009 (Released:2009-07-15)

被引用文献数

1 1

著者

上原 洋一 潮田 資勝

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.51, no.12, pp.796-800, 2008 (Released:2009-01-15)

参考文献数

21

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Scanning tunneling microscope (STM) light emission spectroscopy provides a powerful tool for characterization of individual nanometer scale structures on solid surfaces. However, the light to be detected is usually very weak. It is desirable to improve the intensity level for measurements with good signal-to-noise ratio. For this purpose the role that the STM tip-sample gap plays in the light emission is analyzed by the dielectric theory of STM light emission. Based on the theoretical predictions, we discuss how one can obtain strong STM light emission and problems associated with the enhancement of emission.

著者

齊藤 芳男 高橋 竜太郎

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.54, no.12, pp.621-626, 2011 (Released:2012-01-12)

参考文献数

10

被引用文献数

2 4

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The LCGT (Large-scale Cryogenic Gravitational wave Telescope) is an interferometer of 3-km long baseline, using a laser beam of 1064-nm wavelength. The entire system of the interferometer is to be operated in a vacuum for avoiding any noises caused by in-space molecules and adsorbed molecules on the mirrors. The beam tubes of 3 km long and 800 mm in diameter are to be kept in the order of 10−7 Pa so as to reduce scattering-effects due to residual gas molecules. In April 2011, production of 484 of unit tubes of 12 m long and 800 mm in diameter, having a flexible bellows and flanges, were started. In this report, the production process of the unit tubes is described concerning surface treatment for outgas reduction.

著者

奥村 康之

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.60, no.2, pp.64-67, 2017 (Released:2017-02-17)

参考文献数

12

被引用文献数

1 3

著者

中山 勝矢

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.59, no.8, pp.197, 2016 (Released:2016-09-16)

著者

柳内 克昭 平田 京 石田 洋一

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.55, no.5, pp.220-225, 2012 (Released:2012-06-20)

参考文献数

26

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With the increase in the recording density of hard disk drives, the narrower magnetic pole and read-sensor widths in writing and reading heads are required, and techniques used for the magnetic behavior analysis in a nanoscale area is essential. The observation of the in-plane domain structure of the writer pole for a perpendicular recording (PMR) head was performed by electron holography in order to elucidate the mechanism of the pole erasure originating from the instability of the magnetic domain state. The results revealed that the stability of the domain structure is strongly related to the domain wall trapping, and the pole erasure can be suppressed by realizing the stable domain structures. With respect to a current perpendicular to plane (CPP)-giant magneto-resistive (GMR) head, which has been promising candidates of a next-generation reading head element, the insertion of non-magnetic materials, such as Cu, between the ferromagnetic pinned and free layers is known to increase the MR ratio. For realizing the practical use of the CPP-GMR head, effects of the insertion of materials on the increase in the MR ratio were investigated by X-ray magnetic circular dichroism (XMCD). The results revealed that XMCD is a powerful technique to obtain information on electronic states and magnetic moments with the help of the theoretical electronic band calculation. The potential application of secondary cantilever resonance magnetic force microscopy and spin-polarized scanning electron microscope to the in-situ magnetic imaging of PMR heads will be also discussed.

著者

酒井 純朗

出版者

The Vacuum Society of Japan

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.57, no.3, pp.79-79, 2014

著者

小林 啓介

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.56, no.9, pp.365-376, 2013 (Released:2013-09-28)

参考文献数

35

被引用文献数

1

---

Hard X-ray photoelectron spectroscopy (HXPES) has developed to be used in wide ranges of solid state science and technology due to its much larger information depth comparing to the conventional X-ray photoelectron spectroscopy. It enabled to investigate buried layers as deep as more than 20 nm from the surface. Here in this article, various applications of HXPES to the deep layer investigations including chemical state profiling by takeoff angle dependence measurements and standing wave methods, intermixing analysis of metal multilayers, analysis of band bending at the semiconductor hetero interfaces, analysis of 2 dimensional carriers in strongly correlated materials interfaces, electronic structure observations at buried layers and their interfaces in devices. Laboratory HXPES system with monochromatic Cr Kα X-ray excitations is also introduced with its applications to Si MOS gate stack model samples including interface state spectroscopy by electric field application are also introduced.

著者

内橋 隆 プニート ミシュラ

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.57, no.9, pp.324-331, 2014 (Released:2014-09-30)

参考文献数

45

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After a brief introduction of the spin-polarized scanning tunneling microscopy (SP-STM), its measurement techniques are described based on our recent experimental results. We have observed anomalously high spin contrast for epitaxially grown Mn(001)/Fe(001) samples. This phenomenon can be attributed to a single atom or a cluster of Mn attached to the apex of the thin film Fe tip. This interpretation is supported by a recent first-principle calculation of model magnetic tips. These results stress the importance of the identification of the magnetic tip and its precise control at an atomic level for the purpose of SP-STM measurement.

著者

楊 金峰 菅 晃一 近藤 孝文 室岡 義栄 成瀬 延康 吉田 陽一 谷村 克己 浦川 順治

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.55, no.2, pp.42-49, 2012 (Released:2012-03-28)

参考文献数

24

被引用文献数

2 5

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Two ultrashort electron-bunch photocathode RF guns in picosecond (ps) and femtosecond (fs) time region are reviewed. The ps gun was developed and used successfully to generate an ultralow-emittance and high-charge electron beam with normalized emittance of 1.2 mm-mrad at bunch charge of 1 nC. The low-emittance electron beam has been used successfully to produce a 100-fs high-charge electron single bunch with a booster linear accelerator and a magnetic bunch compressor. An ultrafast pulse radiolysis with time resolution of 240 fs was constructed using the fs electron beam for the study of ultrafast reactions in radiation chemistry and biology. The fs gun, developed under the KEK/Osaka University collaboration with a new structure cavity and many improvements, was succeeded in producing directly a near-relativistic 100-fs electron beam with energy of 1-3 MeV. Femtosecond time-resolved electron diffraction has been constructed using the fs RF gun for the study of photon-induced phase transition in materials. Some experimental results of pulse radiolysis and MeV electron diffraction in fs time region were reported and discussed.

著者

加藤 景子 北島 正弘

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.53, no.5, pp.317-326, 2010 (Released:2010-06-10)

参考文献数

70

被引用文献数

1 2

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Carbon nanotubes have potential to make breakthrough achievement in nano-electronics, photonics, and ultrafast devices. We report real-time observations of coherent phonons in aligned single-walled carbon nanotubes through the time-resolved reflectivity measurements with sub-10 fs laser pulses. In the isotropic reflectivity measurements, we observe the radial breathing modes, G and even D modes, while in the anisotropic reflectivity measurements, only the G mode appears. A complex polarization dependence of the G band phonon amplitude in the isotropic reflectivity indicates the superposition of G band phonons with different symmetries.

著者

畠中 和久

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.58, no.9, pp.334-338, 2015 (Released:2015-09-29)

被引用文献数

1

著者

山本 貴博 小鍋 哲

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.57, no.12, pp.457-460, 2014 (Released:2014-12-26)

参考文献数

38

被引用文献数

1

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We give a brief review of thermal transport and thermoelectric properties of graphene and related materials. The thermal conductivity of graphene is extremely high (3,000-5,300 W K−1 m−1) because of strong carbon-carbon bonds and long mean free path of phonons. On the other hand, the thermoelectric coefficients (Seebeck coefficient and Nernst coefficient) are powerful tool for probing the electron scattering mechanism and Dirac fermion features of graphene and related materials.

著者

小野 寛太

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.59, no.12, pp.346-351, 2016 (Released:2016-12-23)

参考文献数

7

被引用文献数

1

---

Scanning transmission x-ray microscopy (STXM) is a unique measurement technique to perform nanoscale x-ray spectroscopy. In this review, we briefly introduce soft x-ray spectroscopy and microscopy technique, and also describe recent results on magnetic imaging and nanoscale x-ray circular dichroism spectroscopy on magnetic materials using STXM.

著者

森本 吉春 藤垣 元治 柾谷 明大

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.54, no.1, pp.32-38, 2011 (Released:2011-03-11)

参考文献数

36

被引用文献数

1 10

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Moire method is a useful method to measure deformation and strain distribution of structures. Moire fringe patterns are analyzed quantitatively and speedy by image processing using a computer. In this paper, the theory of moire method and sampling moire method is introduced. Since the sampling moire method is useful to analyze phases of a moire fringe and a grating from one image of a grating pattern, it is possible to analyze dynamic deformation accurately. Some applications of the sampling moire method to displacement measurement of a beam, and shape and strain measurement of a rubber structure are shown.

著者

稲吉 さかえ

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.57, no.8, pp.299-302, 2014 (Released:2014-08-25)

参考文献数

13

被引用文献数

2

---

The gas pressure of a vacuum system is determined by the outgassing from its surfaces. Outgassing can be categorized into desorption, diffusion and permiation. In this text, the mechanisms of these modes, as well as the countermeasures for them, are discussed. Some methods to evaluate the outgassing rate are also introduced.

著者

近藤 剛弘 中村 潤児

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.51, no.4, pp.245-249, 2008 (Released:2008-06-04)

参考文献数

19

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Significant improvement of the Pt-electrode in polymer electrolyte fuel cells has been found by replacing the support material from carbon black to multi-walled carbon nanotube (CNT). In order to explore the origin for the better performance of the Pt/CNT catalysts, model studies using Pt nano-particles deposited on a highly oriented pyrolytic graphite (HOPG) have been carried out as a surface science approach. It is suggested that monolayer of Pt nano-particles show a quite different electronic nature, leading to very high catalytic activity.

著者

森田 清三

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.51, no.12, pp.769-770, 2008 (Released:2009-01-15)

著者

深谷 有喜

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.59, no.2, pp.35-39, 2016 (Released:2016-03-18)

参考文献数

25

---

Total-reflection high-energy positron diffraction (TRHEPD) is a surface-sensitive tool owing to the total reflection of positrons. Since the sign of the crystal potential energy for positrons is positive, opposite to that for electrons, the positron beam at a grazing incidence is totally reflected at a crystal surface. The penetration depth of the positron beam in the total reflection region is estimated to be about a few Å, which corresponds to the thickness of 1-2 atomic layers. Thus, the positron beam in the total reflection region sees only the topmost surface layer of the crystal. Slightly over the critical angle for the total reflection, the positon beam also sees the underlying surface layer. Adjusting the glancing angle of the incident positron beam, the diffraction intensity selectively contains information about the topmost and the underlying surface layers without any effect from the bulk. Therefore, the TRHEPD is very useful for structure determinations of crystal surface and two-dimensional atomic sheet adsorbed on the substrate. In this paper, we will show the surface-sensitivity of the TRHEPD. Shown is also the recent result of silicene, two-dimensional atomic sheet of silicon, using the TRHEPD.