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  1. Article ; Online: ⁵⁷Fe polarization-dependent synchrotron Mössbauer spectroscopy using a diamond phase plate and an iron borate nuclear Bragg monochromator.

    Mitsui, Takaya / Imai, Yasuhiko / Masuda, Ryo / Seto, Makoto / Mibu, Ko

    Journal of synchrotron radiation

    2015  Volume 22, Issue 2, Page(s) 427–435

    Abstract: Energy-domain (57)Fe polarization-dependent synchrotron radiation Mössbauer spectroscopy was developed by using a diamond X-ray phase plate and an iron borate nuclear Bragg monochromator. The former controls the polarization of the incident synchrotron ... ...

    Abstract Energy-domain (57)Fe polarization-dependent synchrotron radiation Mössbauer spectroscopy was developed by using a diamond X-ray phase plate and an iron borate nuclear Bragg monochromator. The former controls the polarization of the incident synchrotron radiation X-rays and the latter filters the (57)Fe-Mössbauer radiation with a narrow bandwidth of ∼3.4 Γ0 (Γ0 ≃ 4.7 neV: natural linewidth of the (57)Fe nucleus) from the broadband synchrotron radiation. The developed nuclear diffraction optics allowed (57)Fe-Mössbauer studies to be performed with various polarization states, i.e. linear polarization, circular polarization and non-polarization. In this paper, the spectrometer system, beam characterization, performance-test experiments and a grazing-incidence Mössbauer measurement of an isotope-enriched ((57)Fe: 95%) iron thin film are described.
    Language English
    Publishing date 2015-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2021413-3
    ISSN 1600-5775 ; 0909-0495
    ISSN (online) 1600-5775
    ISSN 0909-0495
    DOI 10.1107/S1600577514028306
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: Perpendicular magnetic anisotropy at Fe/Au(111) interface studied by M\"{o}ssbauer, x-ray absorption, and photoemission spectroscopies

    Okabayashi, Jun / Li, Songtian / Sakai, Seiji / Kobayashi, Yasuhiro / Mitsui, Takaya / Tanaka, Kiyohisa / Miura, Yoshio / Mitani, Seiji

    2021  

    Abstract: The origin of the interfacial perpendicular magnetic anisotropy (PMA) induced in the ultrathin Fe layer on the Au(111) surface was examined using synchrotron-radiation-based M\"{o}ssbauer spectroscopy (MS), X-ray magnetic circular dichroism (XMCD), and ... ...

    Abstract The origin of the interfacial perpendicular magnetic anisotropy (PMA) induced in the ultrathin Fe layer on the Au(111) surface was examined using synchrotron-radiation-based M\"{o}ssbauer spectroscopy (MS), X-ray magnetic circular dichroism (XMCD), and angle-resolved photoemission spectroscopy (ARPES). To probe the detailed interfacial electronic structure of orbital hybridization between the Fe 3$d$ and Au 6$p$ bands, we detected the interfacial proximity effect, which modulates the valence-band electronic structure of Fe, resulting in PMA. MS and XMCD measurements were used to detect the interfacial magnetic structure and anisotropy in orbital magnetic moments, respectively. $In$-$situ$ ARPES also confirms the initial growth of Fe on large spin-orbit coupled surface Shockley states under Au(111) modulated electronic states in the vicinity of the Fermi level. This suggests that PMA in the Fe/Au(111) interface originates from the cooperation effects among the spin, orbital magnetic moments in Fe, and large spin-orbit coupling in Au. These findings pave the way to develop interfacial PMA using $p$-$d$ hybridization with a large spin-orbit interaction.
    Keywords Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2021-03-11
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Grazing-incidence synchrotron-radiation ⁵⁷Fe-Mössbauer spectroscopy using a nuclear Bragg monochromator and its application to the study of magnetic thin films.

    Mitsui, Takaya / Masuda, Ryo / Seto, Makoto / Suharyadi, Edi / Mibu, Ko

    Journal of synchrotron radiation

    2012  Volume 19, Issue Pt 2, Page(s) 198–204

    Abstract: Energy-domain grazing-incidence (57)Fe-Mössbauer spectroscopy (E-GIMS) with synchrotron radiation (SR) has been developed to study surface and interface structures of thin films. Highly brilliant (57)Fe-Mössbauer radiation, filtered from SR by a (57)FeBO( ...

    Abstract Energy-domain grazing-incidence (57)Fe-Mössbauer spectroscopy (E-GIMS) with synchrotron radiation (SR) has been developed to study surface and interface structures of thin films. Highly brilliant (57)Fe-Mössbauer radiation, filtered from SR by a (57)FeBO(3) single-crystal nuclear Bragg monochromator, allows conventional Mössbauer spectroscopy to be performed for dilute (57)Fe in a mirror-like film in any bunch-mode operation of SR. A theoretical and experimental study of the specular reflections from isotope-enriched ((57)Fe: 95%) and natural-abundance ((57)Fe: ∼2%) iron thin films has been carried out to clarify the basic features of the coherent interference between electronic and nuclear resonant scattering of (57)Fe-Mössbauer radiation in thin films. Moreover, a new surface- and interface-sensitive method has been developed by the combination of SR-based E-GIMS and the (57)Fe-probe layer technique, which enables us to probe interfacial complex magnetic structures in thin films with atomic-scale depth resolution.
    Language English
    Publishing date 2012-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2021413-3
    ISSN 1600-5775 ; 0909-0495
    ISSN (online) 1600-5775
    ISSN 0909-0495
    DOI 10.1107/S0909049511049958
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book: Seimitsu-X-sen-kōgakukei-ni-yoru-hōshakō-jikken-'yō-tankesshō-zairyō-no-kesshōsei-hyōka

    Kiriyama, Koji / Fukuda, Yoshihiro / Mitsui, Takaya

    A laboratory x-ray measurement system of the crystallinity of single crystal for the synchrotron radiation optics

    (JAEA-technology ; 2009,35)

    2009  

    Title variant A laboratory x-ray measurement system of the crystallinity of single crystal for the synchrotron radiation optics
    Author's details Koji Kiriyama; Takaya Mitsui; Yoshihiro Fukuda
    Series title JAEA-technology ; 2009,35
    Language Japanese ; English
    Size IV, 24 S., Ill., graph. Darst., Tab.
    Publisher JAEA
    Publishing place Tōkaimura
    Document type Book
    Note Text japan. - Zsfassung in engl. Sprache ; Literaturangaben
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  5. Book: Ekitai-chisso-junkan-reikyaku-sōchi-no-dōnyū-to-maruchi-kesshō-bunkōki-eno-kaozō

    Shiwaku, Hideaki / Mitsui, Takaya / Tozawa, Kazukiyo

    Introduction of liquid nitrogen cryogenic cooling system and development of multi-crystal switching system on BL11XU at SPring-8

    (JAEA-Research ; 2009,9)

    2009  

    Title variant Introduction of liquid nitrogen cryogenic cooling system and development of multi-crystal switching system on BL11XU at SPring-8
    Author's details Hideaki Shiwaku; Takaya Mitsui; Kazukiyo Tozawa
    Series title JAEA-Research ; 2009,9
    Language Japanese ; English
    Size VI, 60 S., Ill., graph. Darst., Tab.
    Publisher Japan Atomic Energy Agency
    Publishing place Tōkaimura
    Document type Book
    Note Text japan. - Zsfassung in engl. Sprache ; Literaturverz.: S. 26 - 27
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  6. Article ; Online: High-pressure radiative conductivity of dense silicate glasses with potential implications for dark magmas.

    Murakami, Motohiko / Goncharov, Alexander F / Hirao, Naohisa / Masuda, Ryo / Mitsui, Takaya / Thomas, Sylvia-Monique / Bina, Craig R

    Nature communications

    2014  Volume 5, Page(s) 5428

    Abstract: The possible presence of dense magmas at Earth's core-mantle boundary is expected to substantially affect the dynamics and thermal evolution of Earth's interior. However, the thermal transport properties of silicate melts under relevant high-pressure ... ...

    Abstract The possible presence of dense magmas at Earth's core-mantle boundary is expected to substantially affect the dynamics and thermal evolution of Earth's interior. However, the thermal transport properties of silicate melts under relevant high-pressure conditions are poorly understood. Here we report in situ high-pressure optical absorption and synchrotron Mössbauer spectroscopic measurements of iron-enriched dense silicate glasses, as laboratory analogues for dense magmas, up to pressures of 85 GPa. Our results reveal a significant increase in absorption coefficients, by almost one order of magnitude with increasing pressure to ~50 GPa, most likely owing to gradual changes in electronic structure. This suggests that the radiative thermal conductivity of dense silicate melts may decrease with pressure and so may be significantly smaller than previously expected under core-mantle boundary conditions. Such dark magmas heterogeneously distributed in the lower mantle would result in significant lateral heterogeneity of heat flux through the core-mantle boundary.
    Language English
    Publishing date 2014-11-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms6428
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Erratum: (61)Ni synchrotron radiation-based Mössbauer spectroscopy of nickel-based nanoparticles with hexagonal structure.

    Masuda, Ryo / Kobayashi, Yasuhiro / Kitao, Shinji / Kurokuzu, Masayuki / Saito, Makina / Yoda, Yoshitaka / Mitsui, Takaya / Hosoi, Kohei / Kobayashi, Hirokazu / Kitagawa, Hiroshi / Seto, Makoto

    Scientific reports

    2016  Volume 6, Page(s) 27053

    Language English
    Publishing date 2016-06-02
    Publishing country England
    Document type Journal Article ; Published Erratum
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep27053
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  8. Article ; Online: 61Ni synchrotron radiation-based Mössbauer spectroscopy of nickel-based nanoparticles with hexagonal structure.

    Masuda, Ryo / Kobayashi, Yasuhiro / Kitao, Shinji / Kurokuzu, Masayuki / Saito, Makina / Yoda, Yoshitaka / Mitsui, Takaya / Hosoi, Kohei / Kobayashi, Hirokazu / Kitagawa, Hiroshi / Seto, Makoto

    Scientific reports

    2016  Volume 6, Page(s) 20861

    Abstract: We measured the synchrotron-radiation (SR)-based Mössbauer spectra of Ni-based nanoparticles with a hexagonal structure that were synthesised by chemical reduction. To obtain Mössbauer spectra of the nanoparticles without (61)Ni enrichment, we developed ... ...

    Abstract We measured the synchrotron-radiation (SR)-based Mössbauer spectra of Ni-based nanoparticles with a hexagonal structure that were synthesised by chemical reduction. To obtain Mössbauer spectra of the nanoparticles without (61)Ni enrichment, we developed a measurement system for (61)Ni SR-based Mössbauer absorption spectroscopy without X-ray windows between the (61)Ni84V16 standard energy alloy and detector. The counting rate of the (61)Ni nuclear resonant scattering in the system was enhanced by the detection of internal conversion electrons and the close proximity between the energy standard and the detector. The spectrum measured at 4 K revealed the internal magnetic field of the nanoparticles was 3.4 ± 0.9 T, corresponding to a Ni atomic magnetic moment of 0.3 Bohr magneton. This differs from the value of Ni3C and the theoretically predicted value of hexagonal-close-packed (hcp)-Ni and suggested the nanoparticle possessed intermediate carbon content between hcp-Ni and Ni3C of approximately 10 atomic % of Ni. The improved (61)Ni Mössbauer absorption measurement system is also applicable to various Ni materials without (61)Ni enrichment, such as Ni hydride nanoparticles.
    Language English
    Publishing date 2016-02-17
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep20861
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  9. Article: Synchrotron-radiation-based Mössbauer spectroscopy.

    Seto, Makoto / Masuda, Ryo / Higashitaniguchi, Satoshi / Kitao, Shinji / Kobayashi, Yasuhiro / Inaba, Chika / Mitsui, Takaya / Yoda, Yoshitaka

    Physical review letters

    2009  Volume 102, Issue 21, Page(s) 217602

    Abstract: We have developed a new method that yields Mössbauer absorption spectra using synchrotron radiation (SR); this method is applicable for almost all Mössbauer nuclides including those that cannot be measured by previous methods using radioisotope (RI) ... ...

    Abstract We have developed a new method that yields Mössbauer absorption spectra using synchrotron radiation (SR); this method is applicable for almost all Mössbauer nuclides including those that cannot be measured by previous methods using radioisotope (RI) sources. The Mössbauer spectrum of the 68.752 keV excited state of 73Ge, which cannot be measured using a RI source, was measured using SR. Our results show that this method can be used to perform advanced Mössbauer spectroscopy measurements owing to the excellent features of SR.
    Language English
    Publishing date 2009-05-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.102.217602
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Development of an energy-domain 57Fe-Mössbauer spectrometer using synchrotron radiation and its application to ultrahigh-pressure studies with a diamond anvil cell.

    Mitsui, Takaya / Hirao, Naohisa / Ohishi, Yasuo / Masuda, Ryo / Nakamura, Yumiko / Enoki, Hirotoshi / Sakaki, Kouji / Seto, Makoto

    Journal of synchrotron radiation

    2009  Volume 16, Issue Pt 6, Page(s) 723–729

    Abstract: An energy-domain (57)Fe-Mössbauer spectrometer using synchrotron radiation (SR) with a diamond anvil cell (DAC) has been developed for ultrahigh-pressure measurements. The main optical system consists of a single-line pure nuclear Bragg reflection from ... ...

    Abstract An energy-domain (57)Fe-Mössbauer spectrometer using synchrotron radiation (SR) with a diamond anvil cell (DAC) has been developed for ultrahigh-pressure measurements. The main optical system consists of a single-line pure nuclear Bragg reflection from an oscillating (57)FeBO(3) single crystal near the Néel temperature and an X-ray focusing device. The developed spectrometer can filter the Doppler-shifted single-line (57)Fe-Mössbauer radiation with a narrow bandwidth of neV order from a broadband SR source. The focused incident X-rays make it easy to measure a small specimen in the DAC. The present paper introduces the design and performance of the SR (57)Fe-Mössbauer spectrometer and its demonstrative applications including the newly discovered result of a pressure-induced magnetic phase transition of polycrystalline (57)Fe(3)BO(6) and an unknown high-pressure phase of Gd(57)Fe(2) alloy placed in a DAC under high pressures up to 302 GPa. The achievement of Mössbauer spectroscopy in the multimegabar range is of particular interest to researchers studying the nature of the Earth's core.
    Language English
    Publishing date 2009-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2021413-3
    ISSN 1600-5775 ; 0909-0495
    ISSN (online) 1600-5775
    ISSN 0909-0495
    DOI 10.1107/S0909049509033615
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