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  1. Article ; Online: Half-Metallic Heusler Alloy/MoS

    Larionov, Konstantin V / Pais Pereda, Jose J / Li, Songtian / Sakai, Seiji / Sorokin, Pavel B

    ACS applied materials & interfaces

    2022  

    Abstract: Integration of half-metallic materials and 2D spacers into vertical magnetoresistive spin valves may pave the way for effective low-power consumption storage and memory technologies. Driven by the recent successful growth of graphene/half-metallic ... ...

    Abstract Integration of half-metallic materials and 2D spacers into vertical magnetoresistive spin valves may pave the way for effective low-power consumption storage and memory technologies. Driven by the recent successful growth of graphene/half-metallic Co
    Language English
    Publishing date 2022-12-02
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.2c09655
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book: Kodomo gyakutai no rinshō

    Sakai, Seiji

    igakuteki shindan to taiō = Medical diagnosis and management of child abuse and neglect

    2005  

    Title variant Medical diagnosis and management of child abuse and neglect
    Author's details hencho Sakai Seiji, Okuyama Makiko, Inoue Nario
    MeSH term(s) Child Abuse ; Wounds and Injuries/diagnosis
    Language Japanese ; Icelandic
    Size xi, 333 p. :, ill.
    Edition 1-pan.
    Publisher Nanzandō
    Publishing place Tōkyō
    Document type Book
    Note Text is Japanese.
    ISBN 9784525282011 ; 4525282010
    Database Catalogue of the US National Library of Medicine (NLM)

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  3. 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)

    Full text online

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  4. Article ; Online: One-atom-thick 2D copper oxide clusters on graphene.

    Kano, Emi / Kvashnin, Dmitry G / Sakai, Seiji / Chernozatonskii, Leonid A / Sorokin, Pavel B / Hashimoto, Ayako / Takeguchi, Masaki

    Nanoscale

    2017  Volume 9, Issue 11, Page(s) 3980–3985

    Abstract: The successful isolation and remarkable properties of graphene have recently triggered investigation of two-dimensional (2D) materials from layered compounds; however, one-atom-thick 2D materials without bulk layered counterparts are scarcely reported. ... ...

    Abstract The successful isolation and remarkable properties of graphene have recently triggered investigation of two-dimensional (2D) materials from layered compounds; however, one-atom-thick 2D materials without bulk layered counterparts are scarcely reported. Here we report the structure and properties of novel 2D copper oxide studied by experimental and theoretical methods. Electron microscopy observations reveal that copper oxide can form monoatomic layers with an unusual square lattice on graphene. Density functional theory calculations suggest that oxygen atoms at the centre of the square lattice stabilizes the 2D Cu structure, and that the 2D copper oxide sheets have unusual electronic and magnetic properties different from 3D bulk copper oxide.
    Language English
    Publishing date 2017-03-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/c6nr06874j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Theoretical Investigation of the Interfaces and Mechanisms of Induced Spin Polarization of 1D Narrow Zigzag Graphene- and h-BN Nanoribbons on a SrO-Terminated LSMO(001) Surface.

    Avramov, Paul / Kuzubov, Alexander A / Kuklin, Artem V / Lee, Hyosun / Kovaleva, Evgenia A / Sakai, Seiji / Entani, Shiro / Naramoto, Hiroshi / Sorokin, Pavel B

    The journal of physical chemistry. A

    2017  Volume 121, Issue 3, Page(s) 680–689

    Abstract: The structure of the interfaces and the mechanisms of induced spin polarization of 1D infinite and finite narrow graphene- and h-BN zigzag nanoribbons placed on a SrO-terminated ... ...

    Abstract The structure of the interfaces and the mechanisms of induced spin polarization of 1D infinite and finite narrow graphene- and h-BN zigzag nanoribbons placed on a SrO-terminated La
    Language English
    Publishing date 2017-01-26
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5215
    ISSN (online) 1520-5215
    DOI 10.1021/acs.jpca.6b09696
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Self-assembling hybrid nanoparticles during simultaneous deposition of Co and C60 on sapphire.

    Lavrentiev, Vasily / Vacik, Jiri / Naramoto, Hiroshi / Sakai, Seiji

    Journal of nanoscience and nanotechnology

    2009  Volume 9, Issue 7, Page(s) 4305–4310

    Abstract: The Co-C60 nano-composite film prepared by simultaneous deposition of Co and C60 at room temperature (RT) on sapphire with high content of cobalt (50 at.% Co) is recognized as ensemble of the fcc-Co crystals (5-6 nm in size) separated by the C60-based ... ...

    Abstract The Co-C60 nano-composite film prepared by simultaneous deposition of Co and C60 at room temperature (RT) on sapphire with high content of cobalt (50 at.% Co) is recognized as ensemble of the fcc-Co crystals (5-6 nm in size) separated by the C60-based matrix. It is shown formation of internal stress in the composition arising due to the phase separation. The internal stress causes the phenomena sufficiently influencing structure of the nano-composite. One of them is locking the Co atoms within the C60-based matrix (retained Co atoms) occurring during the separation process. Analysis of the Raman spectrum argues that the retained Co atoms are included in the Co-C60 polymer dominating in the matrix of nano-composite. It is suggested importance of the internal stress for the polymer formation. Another phenomenon is the structural relaxation releasing the internal stress. These phenomena are tested through applying different thermal treatments. Raman spectrum of the mixture film deposited at 200 degrees C shows the lower polymerization efficiency in the C60-based matrix due to the more complete phase separation decreasing number of the retained Co atoms. Post-deposition annealing of the RT-deposited Co-C60 mixture film done at 300 degrees C for 1 hour induces the structural relaxation as conversion of fullerene into the regular carbon structure. According to the Raman analysis the regular carbon structure corresponds to the single-wall carbon nanotubes (SWNT) doped by cobalt. Similar analysis of the 200 degrees C-deposited mixture film treated by the following annealing reveals formation of SWNT only after much longer annealing. These experiments designate the Co diffusion as a main process driven by the carbon nanotube formation. The results demonstrate remarkable opportunity to control structure of the Co-C60 nano-composite using proper thermal treatments.
    Language English
    Publishing date 2009-10-22
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1533-4880
    ISSN 1533-4880
    DOI 10.1166/jnn.2009.m50
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Thermal effect on structure organizations in cobalt-fullerene nanocomposition.

    Lavrentiev, Vasily / Vacik, Jiri / Naramoto, Hiroshi / Sakai, Seiji

    Journal of nanoscience and nanotechnology

    2009  Volume 10, Issue 4, Page(s) 2624–2629

    Abstract: Effect of deposition temperature (Ts) on structure of Co-C60 nanocomposite (NC) prepared by simultaneous deposition of cobalt and fullerene on sapphire is presented. The NC structure variations with Ts increasing from room temperature (RT) to 400 degrees ...

    Abstract Effect of deposition temperature (Ts) on structure of Co-C60 nanocomposite (NC) prepared by simultaneous deposition of cobalt and fullerene on sapphire is presented. The NC structure variations with Ts increasing from room temperature (RT) to 400 degrees C have been analyzed using scanning electron microscopy (SEM), atomic force microscopy (AFM) and Raman spectroscopy. AFM and SEM show granule-like structure of the Co-C60 film. The mixture film deposited at RT includes the hills on the surface suggesting accumulation of internal stress during phase separation. Raman spectra show 25 cm(-1) downshift of Ag(2) C60 peak suggesting -Co-C60- polymerization in C60-based matrix of the NC film. Analysis of Raman spectra has revealed existence of amorphous carbon (a-C) in the NC matrix that argues C60 decomposition. The Ts increase to 200 degrees C causes the surface hills smoothing. In parallel, downshift of the Ag(2) peak decreases to 16 cm(-1) that implies more pronounced phase separation and lower -Co-C60- polymerization efficiency. Also, amount of a-C content slightly increases. Further Ts increasing to 400 degrees C changes the NC structure dramatically. AFM shows evident enlargement of the granules. According to Raman spectra the high Ts deposition yields pronounced C60 decomposition increasing the a-C content. Features of a-C Raman peak imply nucleation of graphitic islands at the NC interfaces. Abundant decomposition of C60 in the mixture film deposited at 400 degrees C is referred to cobalt catalytic effect.
    Language English
    Publishing date 2009-12-31
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1533-4880
    ISSN 1533-4880
    DOI 10.1166/jnn.2010.1391
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Non-chemical fluorination of hexagonal boron nitride by high-energy ion irradiation.

    Entani, Shiro / Larionov, Konstantin V / Popov, Zakhar I / Takizawa, Masaru / Mizuguchi, Masaki / Watanabe, Hideo / Li, Songtian / Naramoto, Hiroshi / Sorokin, Pavel B / Sakai, Seiji

    Nanotechnology

    2019  Volume 31, Issue 12, Page(s) 125705

    Abstract: Two-dimensional materials such as hexagonal boron nitride (h-BN) and graphene have attracted wide attention in nanoelectronics and spintronics. Since their electronic characteristics are strongly affected by the local atomic structure, the heteroatom ... ...

    Abstract Two-dimensional materials such as hexagonal boron nitride (h-BN) and graphene have attracted wide attention in nanoelectronics and spintronics. Since their electronic characteristics are strongly affected by the local atomic structure, the heteroatom doping could allow us to tailor the electronic and physical properties of two-dimensional materials. In this study, a non-chemical method of heteroatom doping into h-BN under high-energy ion irradiation was demonstrated for the LiF/h-BN/Cu heterostructure. Spectroscopic analysis of chemical states on the relevant atoms revealed that 6% ± 2% fluorinated h-BN is obtained by the irradiation of 2.4 MeV Cu
    Language English
    Publishing date 2019-11-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ab5bcc
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Graphene/Half-Metallic Heusler Alloy: A Novel Heterostructure toward High-Performance Graphene Spintronic Devices.

    Li, Songtian / Larionov, Konstantin V / Popov, Zakhar I / Watanabe, Takahiro / Amemiya, Kenta / Entani, Shiro / Avramov, Pavel V / Sakuraba, Yuya / Naramoto, Hiroshi / Sorokin, Pavel B / Sakai, Seiji

    Advanced materials (Deerfield Beach, Fla.)

    2019  Volume 32, Issue 6, Page(s) e1905734

    Abstract: Graphene-based vertical spin valves (SVs) are expected to offer a large magnetoresistance effect without impairing the electrical conductivity, which can pave the way for the next generation of high-speed and low-power-consumption storage and memory ... ...

    Abstract Graphene-based vertical spin valves (SVs) are expected to offer a large magnetoresistance effect without impairing the electrical conductivity, which can pave the way for the next generation of high-speed and low-power-consumption storage and memory technologies. However, the graphene-based vertical SV has failed to prove its competence due to the lack of a graphene/ferromagnet heterostructure, which can provide highly efficient spin transport. Herein, the synthesis and spin-dependent electronic properties of a novel heterostructure consisting of single-layer graphene (SLG) and a half-metallic Co
    Language English
    Publishing date 2019-12-03
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.201905734
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Effective fluorination of single-layer graphene by high-energy ion irradiation through a LiF overlayer

    Entani, Shiro / Mizuguchi, Masaki / Watanabe, Hideo / Antipina, Liubov Yu / Sorokin, Pavel B / Avramov, Pavel V / Naramoto, Hiroshi / Sakai, Seiji

    RSC advances. 2016 July 19, v. 6, no. 72

    2016  

    Abstract: A new non-chemical method for heteroatom doping into single-layer graphene was demonstrated by high-energy ion irradiation of the graphene-based heterostructure. The heterostructure was fabricated by depositing a LiF layer on a single-layer graphene ... ...

    Abstract A new non-chemical method for heteroatom doping into single-layer graphene was demonstrated by high-energy ion irradiation of the graphene-based heterostructure. The heterostructure was fabricated by depositing a LiF layer on a single-layer graphene sheet which was grown on a Cu substrate by chemical vapor deposition. We successfully obtained fluorinated graphene by 2.4 MeV 63Cu2+ ion irradiation through the LiF overlayer. Raman spectroscopy, near edge X-ray absorption fine structure spectroscopy and X-ray photoelectron spectroscopy revealed that 20%-fluorinated graphene is obtained superior to the defect formation by the high-energy ion irradiation up to 1014 ions per cm2. It was also shown that the F atoms are chemically adsorbed on single-layer graphene by the C–F bonds in a similar manner to the fluorinated graphene synthesized by the purely chemical route. The mechanism of the fluorination by the ion irradiation is discussed in terms of electronic excitations of carbon and heteroatoms based on the spectroscopic results.
    Keywords Raman spectroscopy ; X-ray absorption spectroscopy ; X-ray photoelectron spectroscopy ; chemical bonding ; copper ; graphene ; ions ; irradiation ; vapors
    Language English
    Dates of publication 2016-0719
    Size p. 68525-68529.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c6ra09631j
    Database NAL-Catalogue (AGRICOLA)

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