小谷　佳範（Yoshinori Kotani）

プロフィール
分光解析Ⅱグループ・ナノ分光チーム

主幹研究員(技術担当)

メール： ykotani＠spring8.or.jp


軟X線ビームラインであるBL25SUの担当者として利用実験のサポートと共同研究・開発を行っております。特に、磁性体の研究に欠かせない軟X線磁気円二色性(MCD)実験装置の改良、計測システムの構築など技術面に力を入れて活動しています。近年では強磁場走査型軟X線顕微鏡の開発を積極的に進め、磁性体の局所計測や顕微分光を目指した要素技術開発を行っています。また、元素戦略プロジェクト（磁性材料研究拠点）に参加し永久磁石試料の元素選択的イメージング、およびMCDイメージングに取り組んでいます。


外部機関所属先

  • 元素戦略磁性材料研究　研究員

キーワード

  • 軟X線イメージング
  • 顕微分光
  • 計測技術
研究成果

研究論文

    　過去3年間分

    2020

  • “Detection of spin-transfer from metal to molecule by magnetoresistance measurement”, H. Gamou, K. Shimose, R. Enoki, E. Minamitani, A.Shiotari, Y. Kotani, K. Toyoki, T. Nakamura, Y. Sugimoto, M. Kohda J. Nitta and S. Miwa, Nano Lett, 20 (2020) 75-80.

  • “Imaging of transient magnetization dynamics of Co/Pt multilayer dots with X-ray magnetic circular dichroism excited by microwave”, N. Kikuchi, T. Yomogita, K. Sato, S. Okamoto, O. Kitakami, H. Osawa, M. Suzuki, K. Toyoki, Y. Kotani and T. Nakamura, Jpn. J. Appl. Phys, 59, SEED03 (2020)

  • “Giant anomalous Hall conductivity at Pt/Cr2O3 interface in absence of net magnetic moment” , T. Moriyama, Y. Shiratsuchi, T. Iino, H. Aono, M. Suzuki, T. Nakamura, Y. Kotani, R. Nakatani, K. Nakamura and T. Ono, Phys. Rev. Applied 13, 034052(2020) 　

  • “Robust magnetic domain in Pt/Co/Au/Cr2O3/Pt stacked film with perpendicular exchange bias”, Y. Shiratsuchi, S. Yoshida, H. Yoshida, Y. Kotani, K. Toyoki and R. Nakatani, Journal of Applied Physics 127, 153902 (2020)

  • “Orbital-dependent electric field effect on magnetism in ultra-thin cobalt”, K. T. Yamada, Y. Shiota, T. Koyama, Y. Kotani, K. Toyoki, H. Mizuno, F. Ando, K. Nakamura, T. Nakamura, D. Chiba and T. Ono, Phys. Rev. B 102, 100407(R) (2020)

  • “Element- and orbital-selective magnetic coherent rotation at the　first-order phase transition of a hard uniaxial ferrimagnet”, Sh. Yamamoto, D. I. Gorbunov, H. Akai, H. Yasumura, Y. Kotani, T. Nakamura and T. Kato, N. V. Mushnikov, A. V. Andreev, H. Nojiri, and J. Wosnitza, Phys. Rev. B 101, 174430

  • “Magnetization manipulation induced by nonlocal spin injection from a perpendicular spin polarizer: Nano-beam X-ray MCD study using an order-sorting-aperture collection method” , H. Suto, N. Kikuchi, S. Okamoto, K. Toyoki, Y. Kotani and T. Nakamura, Appl. Phys. Express, 13, 043002 (2020)

  • “Voltage-controlled magnetic anisotropy in an ultrathin nickel film studied by operando X-ray magnetic circular dichroism spectroscopy”, R. Miyakaze, S. Sakamoto, T. Kawabe, T. Tsukahara, Y. Kotani, K. Toyoki, T. Nakamura, M. Goto, Y. Suzuki and S. Miwa, Phys Rev B, 102, 014419 (2020).

  • “Magnetic Microscopy Using a Circularly Polarized Hard-X-ray Nanoprobe at SPring-8”, M. Suzuki, H. Yumoto, T. Koyama, H. Yamazaki, T. Takeuchi, N. Kawamura, M. Mizumaki, H. Osawa, Y. Kondo, J. Ariake, A. Yasui, Y. Kotani, N. Tsuji, T. Nakamura, S. Hirosawa, K. T. Yamada, S. Kim, K.-J. Kim, M. Ishibashi, T. Ono and H. Ohashi, Synchrotron Radiation News, Vol.33, No.2 (2020)

  • “Spin and orbital magnetic moments in perpendicularly magnetized Ni1−xCo2+yO4−z epitaxial thin films: Effects of site-dependent cation valence states”, D. Kan, M. Mizumaki, M. Kitamura, Y. Kotani, Y. Shen, I. Suzuki, K. Horiba and Y. Shimakawa, Phys. Rev. B 101, 224434(2020).


    • 2019

  • “First-order reversal curve analysis of a Nd-Fe-B sintered magnet with soft X-ray magnetic circular dichroism microscopy”, K. Miyazawa, S. Okamoto, T. Yomogita, N. Kikuchi, O. Kitakami, K. Toyoki, D. Billington, Y. Kotani, T. Nakamura, T. Sasaki, T. Ohkubo and K. Hono, Acta Mater. 162, 1-9 (2019)

  • “Enhanced spin–orbit torque via interface engineering in Pt/CoFeB/MgO heterostructures”, H.Y. Lee, S. Kim, J.Y. Park, Y.W. Oh, S.Y. Park, W. S. Ham, Y. Kotani, T. Nakamura, M. Suzuki, T. Ono, K.J. Lee, B.G. Park, APL Mater. 7, 031110 (2019)

  • “Effective protocol for realizing contamination-free X-ray reflective optics”, H. Ohashi, Y. Senba, Y. Kotani, T. Miura, H. Kishimoto and T. Koyama, Review of Scientific Instruments, 90, 021704 (2019)

  • “Observation of orbital angular momentum of chiral magnet CrNb3S6 by soft x-ray magnetic circular dichroism”, M. Mito, H. Ohsumi, T. Shishidou, F. Kuroda, M. Weinert, K. Tsuruta, Y. Kotani, T. Nakamura, Y. Togawa, J. Kishine, Y. Kousaka, J. Akimitsu and K. Inoue, Phys. Rev. B 99, 174439 (2019)

  • “Temperature dependent magnetization reversal precess of a Ga-doped Nd-Fe-B sintered magnet based on first-order reversal curve analysis”, S. Okamoto, K. Miyazawa, T. Yomogita, N. Kikuchi, O. Kitakami, K. Toyoki, D. Billington, Y. Kotani, T. Nakamura, T. Sasaki, T. Ohkubo, K. Hono, Y. Takada, T. Sato, Y. Kaneko and A.Kato, Acta Materialia 178, 90-98 (2019)

  • “Electron Transfer Activity in a Cyanide-Bridged Fe42 Nanomagnet”, M. Baker, S.-Q. Wu, S. Kang, S. Matsuzawa, M.-A. Arrio, Y. Narumi, T Kihara, T. Nakamura, Y. Kotani, O. Sato and H. Nojiri, Inorg. Chem. 2019, 58, 15, 10160-10166

  • “Microscopic origin of large perpendicular magnetic anisotropy in an FeIr/MgO system”, S. Miwa,T. Nozaki, M. Tsujikawa, M. Suzuki,T. Tsukahara, T. Kawabe, Y. Kotani, K. Toyoki, M. Goto, T. Nakamura, M. Shirai, S. Yuasa and Y. Suzuki, Phys. Rev. B 99, 184421 (2019)

    • 2018

  • “Antiferromagnetic domain wall creep driven by magnetoelectric effect”, Y. Shiratsuchi, H. Yoshida, T.V.A. Nguyen, Y. Kotani, K. Toyoki, T. Nakamura and R. Nakatani, APL Materials, 6, 121104 (2018).

  • “Inserted metals for low-energy magnetoelectric switching in a Cr2O3/ ferromagnet interfacial exchange-biased thin film system”, S. Ye, T. Nozaki, Y. Kotani, K. Toyoki, T. Nakamura, S. Yonemura, T. Shibata, S. Pati, M. Al-Mahdawi, Y. Shiokawa and M. Sahashi, J. Mater. Chem. C 6, 2962-2969 (2018).

  • “Geometrical protection of topological magnetic solitons in microprocessed chiral magnets”, M. Mito, H. Ohsumi, K. Tsuruta, Y. Kotani, T. Nakamura, Y. Togawa, M. Shinozaki, Y. Kato, J. Kishine, J. Ohe, Y. Kousaka, J. Akimitsu and K. Inoue, Phys. Rev. B 97, 024408 (2018).

  • “Correlation of the Dzyaloshinskii-Moriya Interaction with Heisenberg Exchange and Orbital Asphericity”, S. Kim, K. Ueda, G. Go, P.H. Jang, K.J. Lee, A. Belabbes, A. Manchon, M. Suzuki, Y. Kotani, T. Nakamura, K. Nakamura, T. Koyama, D. Chiba, K. Yamada, D.H. Kim, T. Moriyama, K.J. Kim and T. Ono, Nat. Commun. 9, 1648 (2018).

  • “Temperature dependence of the crystal structures and phase fractions of secondary phases in a Nd-Fe-B sintered magnet”, N. Tsuji, H. Okazaki, W. Ueno, Y. Kotani, D. Billington, A. Yasui, S. Kawaguchi, K. Sugimoto, K. Toyoki, T. Fukagawa, T. Nishiuchi, Y. Gohda, S. Hirosawa, K. Hono and T. Nakamura, Acta Mater. 154, 25-32 (2018).

  • “Electric field effect on magnetism in a MgO/Pd/Co system using a solid-state capacitor structure”, A. Obinata, T. Hirai, Y. Kotani, K. Toyoki, T. Nakamura, T. Koyama and D. Chiba, AIP Advances 8, 115122 (2018)

  • “Realization of a scanning soft X-ray microscope for magnetic imaging under high magnetic fields”, Y. Kotani, Y. Senba, K. Toyoki, D. Billington, H. Okazaki, A. Yasui, W. Ueno, H. Ohashi, S. Hirosawa, Y. Shiratsuchi and T. Nakamura, J. Synchrotron Rad. 25, 1444-1449 (2018).

  • “Unmasking the interior magnetic domain structure and evolution in Nd-Fe-B sintered magnets through high-field magnetic imaging of the fractured surface”, D. Billington, K. Toyoki, H. Okazaki, Y. Kotani, T. Fukagawa, T. Nishiuchi, S. Hirosawa and T. Nakamura, Phys. Rev. Mater, 2, 104413 (2018)

  • “Observation of the magnetoelectric reversal process of the antiferromagnetic domain”, Y. Shiratsuchi, S. Watanabe, H. Yoshida, N. Kishida, R. Nakatani, Y. Kotani, K. Toyoki and T. Nakamura, Appl. Phys. Lett, 113, 242404 (2018)

  • “Manipulation of Antiferromagnetic Spin Using Tunable Parasitic Magnetization in Magnetoelectric Antiferromagnet”, T. Nozaki, M. Al‐Mahdawi, Y. Shiokawa, S. Prakash Pati, S. Ye, Y. Kotani, K. Toyoki, T. Nakamura, M. Suzuki,S. Yonemura, T. Shibata and M. Sahashi,　Physica status solidi 12, 1800366 (2018)

    • 競争的資金

  • 科学研究費助成事業 基盤研究（C）（2020〜2023年度）「磁化ダイナミックス計測と3次元計測に向けた軟X線MCD顕微鏡のイメージング法開発」　研究代表者
  • 科学研究費助成事業 基盤研究（A）（2015〜2017年度）「放射光によるナノ磁化ダイナミクス可視化科学の構築」　代表：中村哲也, 　研究分担者
  • 科学研究費助成事業 若手研究（B）（2013〜2014年度）「ナノスケール磁気機能解明のための高速走査軟X線磁気顕微鏡の開発」　研究代表者

    • ビームライン高度化

    • 元素戦略に基づく材料開発のための軟X線ナノビームラインBL25SU基盤整備　SPring-8利用者情報誌, Vol.19, No.2, p.102-105 (2014).
    • BL25SU（軟X線固体分光ビームライン）の現状（2014）, SPring-8/SACLA利用研究成果集

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