H. Kimura

Tokyo Denki University

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Tetsuya Ishikawa

SPring-8

J. Mizuki

Kwansei Gakuin University

Shigeru Kimura

Japan Synchrotron Radiation Research Institute

Hiroshi Yamazaki

SPring-8

T. Matsushita

Nara Institute of Science and Technology

Haruhiko Ohashi

Japan Synchrotron Radiation Research Institute

Hajime Tanida

Japan Atomic Energy Agency

Junji Matsui

Eisai (United States)

Shunji Goto

Tokyo Women's Medical University

Hironobu Maeda

Kyushu Institute of Technology

Cooperative Institutions

SPring-8

102

Japan Synchrotron Radiation Research Institute

Tohoku University

Osaka University

Kyoto University

The University of Tokyo

NEC (Japan)

RIKEN

National Institute of Advanced Industrial Science and Technology

High Energy Accelerator Research Organization

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Understanding demonstratives produced by agents

H. Kimura Harumi Kobayashi T. Yasuda

10.1145/3687272.3690892

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Field-induced ferroelectric and commensurate spin state in mutiferroic HoMn$_{2}$O$_{5}$

arXiv (Cornell University) (2006)

H. Kimura Youichi Kamada Yohei Noda Koji Kaneko N. Metoki

Neutron diffraction measurements under high magnetic fields have been performed for the multiferroic compound HoMn$_{2}$O$_{5}$. At zero field, high-temperature incommensurate magnetic (HT-ICM) -- commensurate magnetic (CM) -- low-temperature incommensurate magnetic (LT-ICM) orders occur with decreasing temperature, where ferroelectric polarization arises only in the CM phase. Upon applying a magnetic field, the LT-ICM phase completely disappears and the CM phase is induced at the lowest temperature. This field-induced CM state is completely associated with the field-induced electric polarization in this material [Higashiyama {\it et al}., Phys. Rev. B {\bf 72}, 064421 (2005).], strongly indicating that the commensurate spin state is essential to the ferroelectricity in the multiferroic $R$Mn$_{2}$O$_{5}$ system.

10.48550/arxiv.cond-mat/0602226

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RISING beamline (BL28XU) for rechargeable battery analysis

Journal of Synchrotron Radiation (2013)

Hajime Tanida Katsutoshi Fukuda Haruno Murayama Yuki Orikasa Hajime Arai

The newly installed BL28XU beamline at SPring-8 is dedicated to in situ structural and electronic analysis of rechargeable batteries. It supports the time range (1 ms to 100 s) and spatial range (1 µm to 1 mm) needed for battery analysis. Electrochemical apparatus for battery charging and discharging are available in experimental hutches and in a preparation room. Battery analysis can be carried out efficiently and effectively using X-ray diffraction, X-ray absorption fine-structure analysis and hard X-ray photoelectron spectroscopy. Here, the design and performance of the beamline are described, and preliminary results are presented.

SPring-8

X-ray absorption spectroscopy

10.1107/s1600577513025733

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Citations (24)

SPring-8 BL36XU: Catalytic Reaction Dynamics for Fuel Cells

Journal of Physics Conference Series (2016)

Oki Sekizawa Tomoya Uruga Yasumasa Takagi Kiyofumi Nitta Koichi Kato

A tapered undulator beamline BL36XU was constructed at SPring-8 to conduct structural and electronic analysis of dynamic events on polymer electrolyte fuel cell (PEFC) cathode catalysts for the development of next-generation PEFCs. BL36XU provides various time and spatially resolved XAFS techniques in an energy range from 4.5 to 35 keV for investigating PEFCs under the operating conditions. In addition, we developed in-situ complementary measurement systems, such as in-situ time-resolved XAFS/XRD and ambient pressure HAXPES systems. This report describes the performance and present status of the BL36XU.

SPring-8

10.1088/1742-6596/712/1/012142

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Magnetism, ferroelectricity and lattice modulation of RMn₂O₅

Acta Crystallographica Section A Foundations of Crystallography (2005)

Yukio Noda H. Kimura Youichi Kamada S. Kobayashi Kay Kohn

PyBF 4 at room temperature was carried out, and we confirmed that the pyridinium and tetrafluoroborate ions were in the disorder state.Now, we are doing the X-ray structure analyses of low temperature phases in PyBF 4 single-crystal.In congress, we will show the crystal structures of low temperature phases and discuss the successive phase transition mechanism in PyBF 4 .

Magnetism

Modulation (music)

Lattice (music)

10.1107/s0108767305083108

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Water-cooled first crystals for the SPring-8 x-ray undulator beamlines

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1999)

Hiroshi Yamazaki H. Kimura Isao Kagaya Chitoshi Yamashita Tetsuya Ishikawa

In SPring-8, the first crystals with pin-post water path have widely used at x-ray undulator beamlines. The crystals have been fabricated by using metal diffusive bonding technique. Although the initial crystals had sufficient endurance for high heat load, deterioration of the performance due to the strain induced by the water pressure was observed. Newly designed crystal showed better diffraction properties. Some problems to be improved are also discussed.

Undulator

SPring-8

Crystal (programming language)

10.1117/12.370089

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Citations (17)

X-ray phase contrast imaging study of activated carbon/carbon composite

MRS Proceedings (1999)

Kenji Kobayashi Koichi Izumi H. Kimura Shigeru Kimura Tomoaki Ohira

Carbon fibers

Crystal (programming language)

10.1557/proc-590-273

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Citations (2)

Soft X-ray Resonant Magnetic Reflectivity Study on Induced Magnetism in [Fe₇₀Co₃₀/Pd]_nSuper-Lattice Films

Journal of Physics Conference Series (2007)

N. Awaji K. Noma Kenji Nomura Shuuichi Doi T. Hirono

We performed soft x-ray resonant magnetic reflectivity experiments on [FeCo/Pd]n super-lattice films to study the depth profile of magnetization near the interface. From the analysis of the reflectivity measured at the Fe-LIIIabsorption edge, we obtained the magnetization profiles for the samples with different FeCo layer thicknesses. The profiles can be divided into three different zones: (A) Mixed region at the Pd interface where the magnetization decreased due to the structural randomness, (B) Enhanced region where the magnetization increased, and (C) Non-enhanced region. We estimated the thickness where the FeCo magnetization is enhanced by the adjacent Pd layer is about 4 atomic monolayers.

Magnetism

Lattice (music)

X-ray reflectivity

10.1088/1742-6596/83/1/012034

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X-ray phase-contrast imaging with submicron resolution by using extremely asymmetric Bragg diffractions

Applied Physics Letters (2001)

Kenji Kobayashi Koichi Izumi H. Kimura Shigeru Kimura Takashi Ibuki

We have obtained x-ray phase-contrast images with high spatial resolution by using extremely asymmetric Si 111 Bragg diffractions near the critical angle of the total reflection. The x-ray image could be magnified to 294 times in both vertical and horizontal directions. By using this x-ray microscopy system, we have observed clear phase-contrast images of a 0.7-μm-wide gold-line pattern.

Reflection

10.1063/1.1337621

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Citations (21)

Local Lattice Anomalies in Epitaxial YBa₂Cu₃O_7-δThin Film Studied by X-Ray Absorption Fine Structure

Journal of the Physical Society of Japan (1995)

H. Ōyanagi H. Kimura Takahito Terashima Yoshichika Bandō

The temperature dependence of the local structure in epitaxial YBa 2 Cu 3 O 7-δ thin film has been studied by polarized extended X-ray absorption fine structure (EXAFS) on the Cu K-edge. The results suggest that the local lattice anomalies occur not only at T c but also well above T c . The mean-square relative displacements for the two out-of-plane Cu–O bonds (Cu1–O4, Cu2–O4) s i m u l t a n e o u s l y increased at T c . The in-plane Cu–O bonds showed the anomalous decrease of dynamical disorder below 120 K ∼1.5 T c followed by a sharp increase at T c which saturates at lower temperature, consistent with other lattice anomalies or dynamical spin susceptibilities observed at ∼1.5 T c . These suggest that the anomaly in in-plane oxygen atom vibrations below 1.5 T c is caused by the coupling between lattice distortions and magnetic excitations. The correlated displacement of apical oxygen atoms may induce a bilayer coupling associated with a charge transfer.

Lattice (music)

10.1143/jpsj.64.2563

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Citations (7)