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Yasui A, Takagi Y, Osaka T, Senba Y, Yamazaki H, Koyama T, Yumoto H, Ohashi H, Motomura K, Nakajima K, Sugahara M, Kawamura N, Tamasaku K, Tamenori Y, Yabashi M. BL09XU: an advanced hard X-ray photoelectron spectroscopy beamline of SPring-8. JOURNAL OF SYNCHROTRON RADIATION 2023; 30:1013-1022. [PMID: 37610343 PMCID: PMC10481277 DOI: 10.1107/s160057752300629x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 07/20/2023] [Indexed: 08/24/2023]
Abstract
The BL09XU beamline of SPring-8 has been reorganized into a beamline dedicated for hard X-ray photoelectron spectroscopy (HAXPES) to provide advanced capabilities with upgraded optical instruments. The beamline has two HAXPES analyzers to cover a wide range of applications. Two sets of double channel-cut crystal monochromators with the Si(220) and (311) reflections were installed to perform resonant HAXPES analyses with a total energy resolution of less than 300 meV over a wide energy range (4.9-12 keV) while achieving a fixed-exit condition. A double-crystal X-ray phase retarder using diamond crystals controls the polarization state with a high degree of polarization over 0.9 in the wide energy range 5.9-9.5 keV. Each HAXPES analyzer is equipped with a focusing mirror to provide a high-flux microbeam. The design and performance of the upgraded instruments are presented.
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Affiliation(s)
- Akira Yasui
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Yasumasa Takagi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Taito Osaka
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Yasunori Senba
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Hiroshi Yamazaki
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Takahisa Koyama
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Hirokatsu Yumoto
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Haruhiko Ohashi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Koji Motomura
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Kyo Nakajima
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | | | - Naomi Kawamura
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Kenji Tamasaku
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Yusuke Tamenori
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Makina Yabashi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
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Ikenaga E, Yasui A, Kawamura N, Mizumaki M, Tsutsui S, Mimura K. Hard X-ray Photoemission Spectroscopy at Two Public Beamlines of SPring-8: Current Status and Ongoing Developments. ACTA ACUST UNITED AC 2018. [DOI: 10.1080/08940886.2018.1483652] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- E. Ikenaga
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan
- Japan Synchrotron Radiation Institute (JASRI), SPring-8, Sayo, Hyogo, Japan
| | - A. Yasui
- Japan Synchrotron Radiation Institute (JASRI), SPring-8, Sayo, Hyogo, Japan
| | - N. Kawamura
- Japan Synchrotron Radiation Institute (JASRI), SPring-8, Sayo, Hyogo, Japan
| | - M. Mizumaki
- Japan Synchrotron Radiation Institute (JASRI), SPring-8, Sayo, Hyogo, Japan
| | - S. Tsutsui
- Japan Synchrotron Radiation Institute (JASRI), SPring-8, Sayo, Hyogo, Japan
| | - K. Mimura
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Japan
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Fujiwara H, Naimen S, Higashiya A, Kanai Y, Yomosa H, Yamagami K, Kiss T, Kadono T, Imada S, Yamasaki A, Takase K, Otsuka S, Shimizu T, Shingubara S, Suga S, Yabashi M, Tamasaku K, Ishikawa T, Sekiyama A. Polarized hard X-ray photoemission system with micro-positioning technique for probing ground-state symmetry of strongly correlated materials. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:735-742. [PMID: 27140153 PMCID: PMC5356621 DOI: 10.1107/s1600577516003003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Accepted: 02/19/2016] [Indexed: 06/05/2023]
Abstract
An angle-resolved linearly polarized hard X-ray photoemission spectroscopy (HAXPES) system has been developed to study the ground-state symmetry of strongly correlated materials. The linear polarization of the incoming X-ray beam is switched by a transmission-type phase retarder composed of two diamond (100) crystals. The best value of the degree of linear polarization was found to be -0.96, containing a vertical polarization component of 98%. A newly developed low-temperature two-axis manipulator enables easy polar and azimuthal rotations to select the detection direction of photoelectrons. The lowest temperature achieved was 9 K, offering the chance to access the ground state even for strongly correlated electron systems in cubic symmetry. A co-axial sample monitoring system with long-working-distance microscope enables the same region on the sample surface to be measured before and after rotation. Combining this sample monitoring system with a micro-focused X-ray beam by means of an ellipsoidal Kirkpatrick-Baez mirror (25 µm × 25 µm FWHM), polarized valence-band HAXPES has been performed on NiO for voltage application as resistive random access memory to demonstrate the micro-positioning technique and polarization switching.
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Affiliation(s)
- Hidenori Fujiwara
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Sho Naimen
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Atsushi Higashiya
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Faculty of Science and Engineering, Setsunan University, Neyagawa, Osaka 572-8508, Japan
| | - Yuina Kanai
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Hiroshi Yomosa
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Kohei Yamagami
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Takayuki Kiss
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Toshiharu Kadono
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Department of Physical Science, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Shin Imada
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Department of Physical Science, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Atsushi Yamasaki
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Faculty of Science and Engineering, Konan University, Kobe 658-8501, Japan
| | - Kouichi Takase
- Department of Physics, College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-0062, Japan
| | - Shintaro Otsuka
- Graduate School of Science and Technology, Kansai University, Suita, Osaka 564-8680, Japan
| | - Tomohiro Shimizu
- Graduate School of Science and Technology, Kansai University, Suita, Osaka 564-8680, Japan
| | - Shoso Shingubara
- Graduate School of Science and Technology, Kansai University, Suita, Osaka 564-8680, Japan
| | - Shigemasa Suga
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | | | | | | | - Akira Sekiyama
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
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Direct observation of half-metallicity in the Heusler compound Co2MnSi. Nat Commun 2014; 5:3974. [PMID: 24875774 PMCID: PMC4050270 DOI: 10.1038/ncomms4974] [Citation(s) in RCA: 275] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 04/28/2014] [Indexed: 11/09/2022] Open
Abstract
Ferromagnetic thin films of Heusler compounds are highly relevant for spintronic applications owing to their predicted half-metallicity, that is, 100% spin polarization at the Fermi energy. However, experimental evidence for this property is scarce. Here we investigate epitaxial thin films of the compound Co2MnSi in situ by ultraviolet-photoemission spectroscopy, taking advantage of a novel multi-channel spin filter. By this surface sensitive method, an exceptionally large spin polarization of (93(-11)(+7)) % at room temperature is observed directly. As a more bulk sensitive method, additional ex situ spin-integrated high energy X-ray photoemission spectroscopy experiments are performed. All experimental results are compared with advanced band structure and photoemission calculations which include surface effects. Excellent agreement is obtained with calculations, which show a highly spin polarized bulk-like surface resonance ingrained in a half metallic bulk band structure.
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Rault JE, Dionot J, Mathieu C, Feyer V, Schneider CM, Geneste G, Barrett N. Polarization sensitive surface band structure of doped BaTiO3(001). PHYSICAL REVIEW LETTERS 2013; 111:127602. [PMID: 24093301 DOI: 10.1103/physrevlett.111.127602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Revised: 07/30/2013] [Indexed: 06/02/2023]
Abstract
We present a spatial and wave-vector resolved study of the electronic structure of micron sized ferroelectric domains at the surface of a BaTiO(3)(001) single crystal. The n-type doping of the BaTiO(3) is controlled by in situ vacuum and oxygen annealing, providing experimental evidence of a surface paraelectric-ferroelectric transition below a critical doping level. Real space imaging of photoemission threshold, core level and valence band spectra show contrast due to domain polarization. Reciprocal space imaging of the electronic structure using linearly polarized light provides unambiguous evidence for the presence of both in- and out-of-plane polarization with two- and fourfold symmetry, respectively. The results agree well with first principles calculations.
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Affiliation(s)
- J E Rault
- CEA, DSM/IRAMIS/SPCSI, F-91191 Gif-sur-Yvette Cedex, France
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