顔写真

PHOTO

Toyoki Kentarou
豊木 研太郎
Toyoki Kentarou
豊木 研太郎
Graduate School of Engineering Division of Materials and Manufacturing Science, Assistant Professor

keyword magnetic thin film,surface/interface physics

Research History 2

  1. 2019/04 - Present
    Osaka University Graduate School of Engineering Assistant Professor

  2. 2015/09 - 2019/03
    Japan Synchrotron Radiation Research Institute Research and Utilization Division Postdoctral Researcher

Education 2

  1. Osaka University Graduate School of Engineering Department of Materials Science and Engineering

    2012/04 - 2015/09

  2. Osaka University Graduate School of Engineering Department of Matrerials Science and Engineering

    2010/04 - 2012/03

Professional Memberships 2

  1. Japan Institute of Metals and Materials

  2. The Magnetic Society of Japan

Research Areas 1

  1. Nanotechnology/Materials / Metallic materials /

Papers 64

  1. Giant gate modulation of antiferromagnetic spin reversal by the magnetoelectric effect

    Kakeru Ujimoto, Hiroki Sameshima, Kentaro Toyoki, Takahiro Moriyama, Kohji Nakamura, Yoshinori Kotani, Motohiro Suzuki, Ion Iino, Naomi Kawamura, Ryoichi Nakatani, Yu Shiratsuchi

    NPG Asia Materials Vol. 16 No. 1 2024/12 Research paper (scientific journal)

  2. Origin of perpendicular magnetic anisotropy in Fe0.6Al0.4/Cr0.8Al0.2 metallic superlattice

    Kentaro Toyoki, Takehiro Minami, Yu Shiratsuchi, Ryoichi Nakatani

    Japanese Journal of Applied Physics Vol. 63 No. 9 p. 09SP32-09SP32 2024/09/02 Research paper (scientific journal)

    Publisher: IOP Publishing
  3. Formation of pseudo-morphic domain in Cr2O3(0001) epitaxial film grown on α-Al2O3(0001) and its effect on Néel temperature

    Hirofumi Ekawa, Hiroki Sameshima, Kentaro Toyoki, Ryoichi Nakatani, Yu Shiratsuchi

    Japanese Journal of Applied Physics Vol. 63 No. 9 p. 09SP33-09SP33 2024/09/02 Research paper (scientific journal)

    Publisher: IOP Publishing
  4. Growth-associated emergence of spontaneous magnetization in Al-doped Cr2O3 thin film

    Tatsuo Tada, Hiroki Sakurai, Kentaro Toyoki, Satoshi Ichikawa, Toshiaki Ina, Noriaki Kishida, Yoshinori Kotani, Masashi Nakamoto, Kota Mori, Ryoichi Nakatani, Yu Shiratsuchi

    Acta Materialia Vol. 274 p. 120027-120027 2024/08 Research paper (scientific journal)

    Publisher: Elsevier BV
  5. Influence of long- and short-range chemical order on spontaneous magnetization in single-crystalline Fe0.6Al0.4 compound thin films

    Kentaro Toyoki, Daigo Kitaguchi, Yu Shiratsuchi, Ryoichi Nakatani

    Journal of Physics: Condensed Matter Vol. 36 No. 13 p. 135805-135805 2023/12/28 Research paper (scientific journal)

    Publisher: IOP Publishing
  6. Direct observation and stochastic analysis on thermally activated nucleation and growth of individual magnetic domain

    Fangfei Luo, Kentaro Toyoki, Chiharu Mitsumata, Jiaqi Shen, Ryoichi Nakatani, Yu Shiratsuchi

    Journal of Magnetism and Magnetic Materials p. 171228-171228 2023/09 Research paper (scientific journal)

    Publisher: Elsevier BV
  7. Direct observation of antiferromagnetic domains and field-induced reversal in Pt/Cr2O3/Pt epitaxial trilayers

    Kakeru Ujimoto, Hiroki Sameshima, Kentaro Toyoki, Yoshinori Kotani, Takahiro Moriyama, Kohji Nakamura, Ryoichi Nakatani, Yu Shiratsuchi

    Applied Physics Letters Vol. 123 No. 2 2023/07/10 Research paper (scientific journal)

    Publisher: AIP Publishing
  8. Chemical order, unit cell volume, and spontaneous magnetization in vapor-quenched single crystalline Fe0.6Al0.4 alloy thin film

    Kentaro Toyoki, Daigo Kitaguchi, Yu Shiratsuchi, Ryoichi Nakatani

    2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers) 2023/05 Research paper (international conference proceedings)

    Publisher: IEEE
  9. Finite size effect and dimensional crossover in antiferromagnetic epitaxial Cr2O3 thin films

    Hiroki Sameshima, Kakeru Ujimoto, Rou Tsutsumi, Kentaro Toyoki, Ryoichi Nakatani, Yu Shiratsuchi

    2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers) 2023/05 Research paper (international conference proceedings)

    Publisher: IEEE
  10. Frequency dependence of coercivity in nickel and Co–Fe–B thin film for DC to 100 kHz region

    K. Toyoki, S. Matsui, Y. Shiratsuchi, Y. Endo, R. Nakatani

    Japanese Journal of Applied Physics 2023/03/01 Research paper (scientific journal)

    Publisher: IOP Publishing
  11. Peculiar temperature dependence of magneto-optic Kerr rotation associated with antiferromagnetic–paramagnetic transition

    Hirofumi Ekawa, Takashi Okano, Oujin Huang, Ion Iino, Kentaro Toyoki, Ryoichi Nakatani, Takeshi Kato, Yu Shiratsuchi

    Japanese Journal of Applied Physics 2023/03/01 Research paper (scientific journal)

    Publisher: IOP Publishing
  12. Gate-induced switching of perpendicular exchange bias with very low coercivity in Pt/Co/Ir/Cr2O3/Pt epitaxial film

    Hirofumi Ekawa, Jiaqi Shen, Kentaro Toyoki, Ryoichi Nakatani, Yu Shiratsuchi

    Applied Physics Letters Vol. 122 No. 6 p. 062404-062404 2023/02/06 Research paper (scientific journal)

    Publisher: AIP Publishing
  13. Anomalous Hall effect in Pt/Al-doped Cr2O3 epitaxial film

    Ion Iino, Tatsuo Tada, Kentaro Toyoki, Ryoichi Nakatani, Yu Shiratsuchi

    AIP Advances Vol. 13 No. 1 p. 015035-015035 2023/01/01 Research paper (scientific journal)

    Publisher: AIP Publishing
  14. Increase of Néel temperature of magnetoelectric Cr2O3 thin film by epitaxial lattice matching

    Xinrui Wang, Kakeru Ujimoto, Kentaro Toyoki, Ryoichi Nakatani, Yu Shiratsuchi

    Applied Physics Letters Vol. 121 No. 18 p. 182402-182402 2022/10/31 Research paper (scientific journal)

    Publisher: AIP Publishing
  15. Synthesis of superparamagnetic Co–Pt nanoparticle in Pyrococcus furiosus virus-like particle crystal

    Makoto Taniguchi, Akifumi Higashiura, Naoto Kobayashi, Daisuke Kanda, Kakeru Tagata, Ryota Fukunishi, Yasunori Yoshikawa, Emi Kuromatsu, Noriaki Kishida, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Ryoichi Nakatani, Atsushi Nakagawa, Yu Shiratsuchi

    Journal of Physics and Chemistry of Solids Vol. 169 p. 110840-110840 2022/06 Research paper (scientific journal)

    Publisher: Elsevier BV
  16. Control of perpendicular magnetic anisotropy at the Fe/MgO interface by phthalocyanine insertion

    Shoya Sakamoto, Edward Jackson, Takeshi Kawabe, Takuya Tsukahara, Yoshinori Kotani, Kentaro Toyoki, Emi Minamitani, Yoshio Miura, Tetsuya Nakamura, Atsufumi Hirohata, Shinji Miwa

    Physical Review B Vol. 105 No. 18 2022/05/13 Research paper (scientific journal)

    Publisher: American Physical Society (APS)
  17. Magnetic-field and temperature dependence of anomalous Hall effect in Pt/Cr2O3/Pt trilayer

    Xinrui Wang, Kentaro Toyoki, Ryoichi Nakatani, Yu Shiratsuchi

    AIP Advances Vol. 12 No. 3 p. 035216-035216 2022/03/01 Research paper (scientific journal)

    Publisher: AIP Publishing
  18. Low pressure drive of the domain wall in Pt/Co/Au/Cr2O3/Pt thin films by the magnetoelectric effect

    Jiaqi Shen, Tatsuo Tada, Kentaro Toyoki, Yoshinori Kotani, Ryoichi Nakatani, Yu Shiratsuchi

    Applied Physics Letters Vol. 120 No. 9 p. 092404-092404 2022/02/28 Research paper (scientific journal)

    Publisher: AIP Publishing
  19. Magnetic Domain Structure Observation for Initial Magnetization and Demagnetization Processes of a Nd-Fe-B Hot-Deformed Magnet Using Soft X-ray Magnetic Circular Dichroism Microscopy

    M. Takeuchi, T. Yomogita, N. Kikuchi, K. Toyoki, S. Kobayashi, Y. Kotani, T. Nakamura, K. Hioki, S. Okamoto

    Journal of the Japan Institute of Metals and Materials Vol. 86 No. 1 p. 1-7 2022/01/01 Research paper (scientific journal)

    Publisher: Japan Institute of Metals
  20. Strain-induced modulation of temperature characteristics in ferrimagnetic Tb–Fe films

    Shinya Ota, Pham Van Thach, Hiroyuki Awano, Akira Ando, Kentaro Toyoki, Yoshinori Kotani, Tetsuya Nakamura, Tomohiro Koyama, Daichi Chiba

    Scientific Reports Vol. 11 No. 1 p. 6237-6237 2021/12 Research paper (scientific journal)

    Publisher: Springer Science and Business Media LLC
  21. Temperature lag with the onset of exchange bias, superparamagnetic blocking, and antiferromagnetic ordering in ultrathin ferromagnet/antiferromagnet thin film

    Yu Shiratsuchi, Yiran Tao, Rou Tsutsumi, Kentaro Toyoki, Ryoichi Nakatani

    Journal of Applied Physics Vol. 130 No. 19 p. 193902-193902 2021/11/21 Research paper (scientific journal)

    Publisher: AIP Publishing
  22. Dominant carrier of pseudo-gap antiferromagnet Cr3Al thin film

    Kentaro Toyoki, Masayuki Hayashi, Shunsuke Hamaguchi, Noriaki Kishida, Yu Shiratsuchi, Takafumi Ishibe, Yoshiaki Nakamura, Ryoichi Nakatani

    Physica B: Condensed Matter Vol. 620 p. 413281-413281 2021/11 Research paper (scientific journal)

    Publisher: Elsevier BV
  23. Performance of Scanning X-ray Back-Scattered Laue Diffraction Microscope with Different Types of Light Sources

    Vol. 9 No. 6 p. 405-410 2021/10 Research paper (bulletin of university, research institution)

  24. Effect of hydrogenation-disproportionation-desorption-recombination powder processing on the demagnetization process of Nd-Fe-B sintered magnets analyzed by soft X-ray magnetic circular dichroism microscopy

    A. Martin-Cid, T. Kawahara, S. Kobayashi, K. Toyoki, D. Billington, Y. Kotani, H. Kubo, Y. Une, T. Iriyama, M. Sagawa, T. Nakamura

    Journal of Magnetism and Magnetic Materials Vol. 538 p. 168308-168308 2021/07 Research paper (scientific journal)

    Publisher: Elsevier BV
  25. Magnetoelectric Induced Switching of Perpendicular Exchange Bias Using 30-nm-Thick Cr2O3 Thin Film

    Yu Shiratsuchi, Yiran Tao, Kentaro Toyoki, Ryoichi Nakatani

    Magnetochemistry Vol. 7 No. 3 p. 36-36 2021/03/09 Research paper (scientific journal)

    Publisher: MDPI AG
  26. Relationship between the microstructure, local magnetism and coercivity in Ga-containing Nd-Fe-B sintered magnets

    David Billington, Hiroyuki Okazaki, Kentaro Toyoki, Yoshinori Kotani, Yukio Takada, Takashi Sato, Yuji Kaneko, Akira Kato, Taisuke T. Sasaki, Tadakatsu Ohkubo, Kazuhiro Hono, Tetsuya Nakamura

    Acta Materialia Vol. 205 p. 116517-116517 2021/02 Research paper (scientific journal)

    Publisher: Elsevier BV
  27. Structural, magnetic, and electric properties of pt/co/au/cr2o3/pt thin film with cr2o3 layer below 25 nm

    Yu Shiratsuchi, Jiaqi Shen, Yiran Tao, Kohei Takahara, Kentaro Toyoki, Ryoichi Nakatani

    Journal of the Magnetics Society of Japan Vol. 45 No. 4 p. 101-105 2021 Research paper (scientific journal)

    Publisher: The Magnetics Society of Japan
  28. Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption

    Masaru Uenohara, Hiroaki Nishio, Kentaro Toyoki, Yu Shiratsuchi, Ryoichi Nakatani, Ken Ichi Machida

    Materials Transactions Vol. 62 No. 8 p. 1216-1224 2021 Research paper (scientific journal)

    Publisher: Japan Institute of Metals
  29. Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys

    D. Billington, A. D. N. James, E. I. Harris-Lee, D. A. Lagos, D. O'Neill, N. Tsuda, K. Toyoki, Y. Kotani, T. Nakamura, H. Bei, S. Mu, G. D. Samolyuk, G. M. Stocks, J. A. Duffy, J. W. Taylor, S. R. Giblin, S. B. Dugdale

    Physical Review B Vol. 102 No. 17 2020/11/05 Research paper (scientific journal)

    Publisher: American Physical Society (APS)
  30. Time-resolved imaging of an operating hard-disk-drive write head using nano-beam x-ray magnetic circular dichroism

    Hirofumi Suto, Akira Kikitsu, Yoshinori Kotani, Tomoyuki Maeda, Kentaro Toyoki, Hitoshi Osawa, Nobuaki Kikuchi, Satoshi Okamoto, Tetsuya Nakamura

    Journal of Applied Physics Vol. 128 No. 13 p. 133903-133903 2020/10/07 Research paper (scientific journal)

  31. Orbital-dependent electric field effect on magnetism in ultrathin cobalt

    Kihiro T. Yamada, Yoichi Shiota, Tomohiro Koyama, Yoshinori Kotani, Kentaro Toyoki, Hayato Mizuno, Fuyuki Ando, Kohji Nakamura, Tetsuya Nakamura, Daichi Chiba, Teruo Ono

    Physical Review B Vol. 102 No. 10 2020/09/17 Research paper (scientific journal)

  32. Effects of texture on lattice constants of Nd2Fe14B and their relationship with internal stress in Nd-Fe-B permanent magnets

    S. Kobayashi, A. Martín-Cid, K. Toyoki, H. Okazaki, S. Kawaguchi, S. Hirosawa, T. Nakamura

    Physical Review Materials Vol. 4 No. 9 2020/09/14 Research paper (scientific journal)

    Publisher: American Physical Society (APS)
  33. Voltage-controlled magnetic anisotropy in an ultrathin nickel film studied by operando x-ray magnetic circular dichroism spectroscopy

    Risa Miyakaze, Shoya Sakamoto, Takeshi Kawabe, Takuya Tsukahara, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Minori Goto, Yoshishige Suzuki, Shinji Miwa

    PHYSICAL REVIEW B Vol. 102 No. 1 2020/07 Research paper (scientific journal)

  34. Robust magnetic domain of Pt/Co/Au/Cr<inf>2</inf>O<inf>3</inf>/Pt stacked films with a perpendicular exchange bias

    Yu Shiratsuchi, Saori Yoshida, Hiroaki Yoshida, Yoshinori Kotani, Kentaro Toyoki, Ryoichi Nakatani, Chiharu Mitsumata, Tetsuya Nakamura

    Journal of Applied Physics Vol. 127 No. 15 p. 153902-153902 2020/04 Research paper (scientific journal)

    Publisher: AIP Publishing
  35. Critical behavior of perpendicular exchange bias in Ru/Pd/Co/Pt/Cr<inf>2</inf>O<inf>3</inf>/Pd stacked films

    Yu Shiratsuchi, Motohiro Suzuki, Kentaro Toyoki, Kohei Wakatsu, Takashi Nishimura, Tetsuya Nakamura, Ryoichi Nakatani

    Physica B: Condensed Matter Vol. 583 p. 412053-412053 2020/04 Research paper (scientific journal)

    Publisher: Elsevier BV
  36. Imaging of transient magnetization dynamics of Co/Pt multilayer dots with X-ray magnetic circular dichroism excited by microwaves

    N. Kikuchi, T. Yomogita, K. Sato, S. Okamoto, O. Kitakami, H. Osawa, M. Suzuki, K. Toyoki, Y. Kotani, T. Nakamura

    Japanese Journal of Applied Physics Vol. 59 No. SE p. SEED03-SEED03 2020/04/01 Research paper (scientific journal)

    Publisher: IOP Publishing
  37. 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

    Hirofumi Suto, Nobuaki Kikuchi, Satoshi Okamoto, Kentaro Toyoki, Yoshinori Kotani, Tetsuya Nakamura

    Applied Physics Express Vol. 13 No. 4 p. 043002-043002 2020/04/01 Research paper (scientific journal)

  38. Realization of magnetoelectric effect in 50-nm-thick Cr<inf>2</inf>O<inf>3</inf> thin film

    Yu Shiratsuchi, Kentaro Toyoki, Tao Yiran, Hikaru Aono, Ryoichi Nakatani

    Applied Physics Express Vol. 13 No. 4 p. 043003-043003 2020/04 Research paper (scientific journal)

    Publisher: IOP Publishing
  39. Detection of Spin Transfer from Metal to Molecule by Magnetoresistance Measurement

    Hiromu Gamou, Koki Shimose, Ryoto Enoki, Emi Minamitani, Akitoshi Shiotari, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Yoshiaki Sugimoto, Makoto Kohda, Junsaku Nitta, Shinji Miwa

    Nano Letters Vol. 20 No. 1 p. 75-80 2020/01/08 Research paper (scientific journal)

    Publisher: American Chemical Society (ACS)
  40. Quantitative identification of constituent phases in a Nd-Fe-B-Cu sintered magnet and temperature dependent change of electron density of Nd2Fe14B studied by synchrotron X-ray diffraction

    Hiroyuki Okazaki, David Billington, Naruki Tsuji, Wakana Ueno, Yoshinori Kotani, Shogo Kawaguchi, Kunihisa Sugimoto, Kentaro Toyoki, Tomoki Fukagawa, Takeshi Nishiuchi, Kazuhiro Hono, Satoshi Hirosawa, Tetsuya Nakamura

    Acta Materialia Vol. 181 p. 530-536 2019/12 Research paper (scientific journal)

  41. Influence of magnetostriction on the lattice constants of the secondary phases in Nd-Fe-B sintered magnets studied by synchrotron X-ray diffraction

    Shintaro Kobayashi, Andrés Martín-Cid, Kentaro Toyoki, Hiroyuki Okazaki, Satoshi Hirosawa, Tetsuya Nakamura

    AIP Advances Vol. 9 No. 12 p. 125154-125154 2019/12/01 Research paper (scientific journal)

    Publisher: AIP Publishing
  42. Temperature dependent magnetization reversal process of a Ga-doped Nd-Fe-B sintered magnet based on first-order reversal curve analysis

    Satoshi Okamoto, Kazunori Miyazawa, Takahiro Yomogita, Nobuaki Kikuchi, Osamu Kitakami, Kentaro Toyoki, David Billington, Yoshinori Kotani, Tetsuya Nakamura, Taisuke Sasaki, Tadakatsu Ohkubo, Kazuhiro Hono, Yukio Takada, Takashi Sato, Yuji Kaneko, Akira Kato

    Acta Materialia Vol. 178 p. 90-98 2019/10 Research paper (scientific journal)

  43. Microscopic origin of large perpendicular magnetic anisotropy in an FeIr/MgO system

    Shinji Miwa, Takayuki Nozaki, Masahito Tsujikawa, Motohiro Suzuki, Takuya Tsukahara, Takeshi Kawabe, Yoshinori Kotani, Kentaro Toyoki, Minori Goto, Tetsuya Nakamura, Masafumi Shirai, Shinji Yuasa, Yoshishige Suzuki

    Physical Review B Vol. 99 No. 18 2019/05/16 Research paper (scientific journal)

    Publisher: American Physical Society (APS)
  44. First-order reversal curve analysis of a Nd-Fe-B sintered magnet with soft X-ray magnetic circular dichroism microscopy

    Kazunori Miyazawa, Satoshi Okamoto, Takahiro Yomogita, Nobuaki Kikuchi, Osamu Kitakami, Kentaro Toyoki, David Billington, Yoshinori Kotani, Tetsuya Nakamura, Taisuke Sasaki, Tadakatsu Ohkubo, Kazuhiro Hono

    Acta Materialia Vol. 162 p. 1-9 2019/01 Research paper (scientific journal)

  45. Observation of the magnetoelectric reversal process of the antiferromagnetic domain

    Yu Shiratsuchi, Shunsuke Watanabe, Hiroaki Yoshida, Noriaki Kishida, Ryoichi Nakatani, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura

    Applied Physics Letters Vol. 113 No. 24 p. 242404-242404 2018/12/10 Research paper (scientific journal)

    Publisher: AIP Publishing
  46. Manipulation of Antiferromagnetic Spin Using Tunable Parasitic Magnetization in Magnetoelectric Antiferromagnet

    Tomohiro Nozaki, Muftah Al‐Mahdawi, Yohei Shiokawa, Satya Prakash Pati, Shujun Ye, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Motohiro Suzuki, Syougo Yonemura, Tatsuo Shibata, Masashi Sahashi

    physica status solidi (RRL) – Rapid Research Letters Vol. 12 No. 12 p. 1800366-1800366 2018/12 Research paper (scientific journal)

    Publisher: Wiley
  47. Antiferromagnetic domain wall creep driven by magnetoelectric effect

    Yu Shiratsuchi, Hiroaki Yoshida, Yoshinori Kotani, Kentaro Toyoki, Thi Van Anh Nguyen, Tetsuya Nakamura, Ryoichi Nakatani

    APL Materials Vol. 6 No. 12 p. 121104-121104 2018/12/01 Research paper (scientific journal)

    Publisher: AIP Publishing
  48. Electric field effect on magnetism in a MgO/Pd/Co system with a solid-state capacitor structure

    Aya Obinata, Takamasa Hirai, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Tomohiro Koyama, Daichi Chiba

    AIP ADVANCES Vol. 8 No. 11 p. 115122-115122 2018/11 Research paper (scientific journal)

  49. Unmasking the interior magnetic domain structure and evolution in Nd-Fe-B sintered magnets through high-field magnetic imaging of the fractured surface

    David Billington, Kentaro Toyoki, Hiroyuki Okazaki, Yoshinori Kotani, Tomoki Fukagawa, Takeshi Nishiuchi, Satoshi Hirosawa, Tetsuya Nakamura

    Physical Review Materials Vol. 2 No. 10 2018/10/26 Research paper (scientific journal)

    Publisher: American Physical Society (APS)
  50. Realization of a scanning soft X-ray microscope for magnetic imaging under high magnetic fields

    Yoshinori Kotani, Yasunori Senba, Kentaro Toyoki, David Billington, Hiroyuki Okazaki, Akira Yasui, Wakana Ueno, Haruhiko Ohashi, Satoshi Hirosawa, Yu Shiratsuchi, Tetsuya Nakamura

    Journal of Synchrotron Radiation Vol. 25 No. 5 p. 1444-1449 2018/09/01 Research paper (scientific journal)

    Publisher: International Union of Crystallography (IUCr)
  51. Temperature dependence of the crystal structures and phase fractions of secondary phases in a Nd-Fe-B sintered magnet

    Naruki Tsuji, Hiroyuki Okazaki, Wakana Ueno, Yoshinori Kotani, David Billington, Akira Yasui, Shogo Kawaguchi, Kunihisa Sugimoto, Kentaro Toyoki, Tomoki Fukagawa, Takeshi Nishiuchi, Yoshihiro Gohda, Satoshi Hirosawa, Kazuhiro Hono, Tetsuya Nakamura

    Acta Materialia Vol. 154 p. 25-32 2018/08/01 Research paper (scientific journal)

    Publisher: Acta Materialia Inc
  52. Inserted metals for low-energy magnetoelectric switching in a Cr2O3/ferromagnet interfacial exchange-biased thin film system

    Shujun Ye, Tomohiro Nozaki, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Syougo Yonemura, Tatsuo Shibata, Satya Prakash Pati, Muftah Al-Mahdawi, Yohei Shiokawa, Masashi Sahashi

    Journal of Materials Chemistry C Vol. 6 No. 12 p. 2962-2969 2018 Research paper (scientific journal)

    Publisher: Royal Society of Chemistry
  53. Electric-field-induced changes of magnetic moments and magnetocrystalline anisotropy in ultrathin cobalt films

    Takeshi Kawabe, Kohei Yoshikawa, Masahito Tsujikawa, Takuya Tsukahara, Kohei Nawaoka, Yoshinori Kotani, Kentaro Toyoki, Minori Goto, Motohiro Suzuki, Tetsuya Nakamura, Masafumi Shirai, Yoshishige Suzuki, Shinji Miwa

    Physical Review B Vol. 96 No. 22 2017/12/26 Research paper (scientific journal)

    Publisher: American Physical Society
  54. Characterization of the magnetic moments of ultrathin Fe film in an external electric field via high-precision X-ray magnetic circular dichroism spectroscopy

    Takuya Tsukahara, Takeshi Kawabe, Koki Shimose, Taishi Furuta, Risa Miyakaze, Kohei Nawaoka, Minori Goto, Takayuki Nozaki, Shinji Yuasa, Yoshinori Kotani, Kentaro Toyoki, Motohiro Suzuki, Tetsuya Nakamura, Yoshishige Suzuki, Shinji Miwa

    Japanese Journal of Applied Physics Vol. 56 No. 6 p. 060304-060304 2017/06/01 Research paper (scientific journal)

    Publisher: Japan Society of Applied Physics
  55. Simultaneous achievement of high perpendicular exchange bias and low coercivity by controlling ferromagnetic/antiferromagnetic interfacial magnetic anisotropy

    Yu Shiratsuchi, Wataru Kuroda, Thi Van Anh Nguyen, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Motohiro Suzuki, Kohji Nakamura, Ryoichi Nakatani

    Journal of Applied Physics Vol. 121 No. 7 p. 073902-073902 2017/02/21 Research paper (scientific journal)

    Publisher: AIP Publishing
  56. Switching of perpendicular exchange bias in Pt/Co/Pt/α-Cr<inf>2</inf>O<inf>3</inf>/Pt layered structure using magneto-electric effect

    Kentaro Toyoki, Yu Shiratsuchi, Atsushi Kobane, Shotaro Harimoto, Satoshi Onoue, Hikaru Nomura, Ryoichi Nakatani

    Journal of Applied Physics Vol. 117 No. 17 p. 17D902-17D902 2015/05/07 Research paper (scientific journal)

    Publisher: AIP Publishing
  57. Magnetoelectric switching of perpendicular exchange bias in Pt/Co/α-Cr2O3/Pt stacked films

    Kentaro Toyoki, Yu Shiratsuchi, Atsushi Kobane, Chiharu Mitsumata, Yoshinori Kotani, Tetsuya Nakamura, Ryoichi Nakatani

    Applied Physics Letters Vol. 106 No. 16 p. 162404-162404 2015/04/20 Research paper (scientific journal)

    Publisher: American Institute of Physics Inc.
  58. Isothermal switching of perpendicular exchange anisotropy in Pt/Co/α-Cr2O3/Pt layered structure by pulsed voltage

    Shiratsuchi Yu, Toyoki Kentaro, Kobane Atsushi, Mitsumata Chiharu, Nakatani Ryoichi

    JSAP Annual Meetings Extended Abstracts Vol. 2015.1 p. 1919-1919 2015/02/26

    Publisher: The Japan Society of Applied Physics
  59. Direct observations of ferromagnetic and antiferromagnetic domains in Pt/Co/Cr2O3/Pt perpendicular exchange biased film

    Yu Shiratsuchi, Yoshinori Kotani, Saori Yoshida, Yasunori Yoshikawa, Kentaro Toyoki, Atsushi Kobane, Ryoichi Nakatani, Tetsuya Nakamura

    AIMS Materials Science Vol. 2 No. 4 p. 484-496 2015 Research paper (scientific journal)

    Publisher: AIMS Press
  60. Equilibrium surface magnetization of α-Cr2O3 studied through interfacial chromium magnetization in Co/α-Cr2O3 layered structures

    Kentaro Toyoki, Yu Shiratsuchi, Tetsuya Nakamura, Chiharu Mitsumata, Shotaro Harimoto, Yuichiro Takechi, Takashi Nishimura, Hikaru Nomura, Ryoichi Nakatani

    Applied Physics Express Vol. 7 No. 11 p. 114201-114201 2014/11/01 Research paper (scientific journal)

    Publisher: Japan Society of Applied Physics
  61. Magneto-electric effect of α-Cr2O3(0001) thin film on perpendicular exchange bias and influence of Pt spacer layer

    Shiratsuchi Yu, Toyoki Kentaro, Nakamura Tetsuya, Suzuki Motohiro, Harimoto Shotaro, Onoue Satoshi, Nomura Hikaru, Mitsumata Chiharu, Nakatani Ryoichi

    JSAP Annual Meetings Extended Abstracts Vol. 2014.2 p. 1831-1831 2014/09/01

    Publisher: The Japan Society of Applied Physics
  62. High-temperature regeneration of perpendicular exchange anisotropy in Pt/Co/Pt/α-Cr2O3/Pt thin film

    Shiratsuchi Yu, Takechi Yuichiro, Toyoki Kentaro, Nakano Yuuta, Onoue Satoshi, Mitsumata Chiharu, Nakatani Ryoichi

    JSAP Annual Meetings Extended Abstracts Vol. 2014.1 p. 1894-1894 2014/03/03

    Publisher: The Japan Society of Applied Physics
  63. Magnetic domain wall energy in Ni/Co superlattices

    Kentaro Toyoki, Takashi Nishimura, Shotaro Harimoto, Yu Shiratsuchi, Ryoichi Nakatani

    Journal of Magnetism and Magnetic Materials Vol. 372 p. 41-46 2014 Research paper (scientific journal)

    Publisher: Elsevier
  64. High-temperature regeneration of perpendicular exchange bias in a Pt/Co/Pt/α-Cr2O3/Pt thin film system

    Yu Shiratsuchi, Yuichiro Takechi, Kentaro Toyoki, Yuuta Nakano, Satoshi Onoue, Chiharu Mitsumata, Ryoichi Nakatani

    Applied Physics Express Vol. 6 No. 12 p. 123004-123004 2013/12 Research paper (scientific journal)

    Publisher: IOP Publishing

Misc. 7

  1. Magnetoelectric control of antiferromagnetic domain state in Cr<inf>2</inf>O<inf>3</inf>thin film

    Yu Shiratsuchi, Kentaro Toyoki, Ryoichi Nakatani

    Journal of Physics Condensed Matter Vol. 33 No. 24 p. 243001-243001 2021/06

    Publisher: {IOP} Publishing
  2. エピタキシャルFe3Si(111)薄膜の軟磁性

    白土優, 豊木研太郎, 山田晋也, NGUYEN Thi Van Anh, 浜屋宏平, 遠藤恭

    日本金属学会講演大会(Web) Vol. 166th 2020

  3. Study on magnetization reversal process of hot-deformed Nd-Fe-B magnets using soft X-ray magnetic circular dichroism microscopy

    Vol. 2019 No. 79 p. 51-55 2019/08/08

    Publisher: 電気学会
  4. 電気磁気効果によるCo/Cr₂O₃界面の界面交換磁気異方性反転とダイナミクス (スピントロニクスにおける次世代材料開発)

    白土 優, Nguyen Thi Van Anh, 豊木 研太郎, 中谷 亮一

    社団法人日本磁気学会研究会資料 = Bulletin of Topical Symposium of the Magnetics Society of Japan Vol. 208 p. 39-44 2016/06/09

    Publisher: 日本磁気学会
  5. Magnetic domain wall energy in Ni/Co superlattice with perpendicular magnetic anisotropy

    TOYOKI Kentaro, SHIRATSUCHI Yu, NAKATANI Ryoichi

    IEICE technical report. Magnetic recording Vol. 113 No. 267 p. 17-22 2013/10/24

    Publisher: The Institute of Electronics, Information and Communication Engineers
  6. Magnetic domain wall energy in Ni/Co superlattice with perpendicular magnetic anisotropy

    Vol. 37 No. 42 p. 17-22 2013/10

    Publisher: 映像情報メディア学会
  7. Magnetization manipulation method for magnetic nanodots with magnetic force microscopy

    MAEHARA Kei, TOYOKI Kentaro, YOKOTA Daisuke, NOMURA Hikaru, NAKATANI Ryoichi

    IEICE technical report. Magnetic recording Vol. 112 No. 416 p. 21-24 2013/01/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

Institutional Repository 18

Content Published in the University of Osaka Institutional Repository (OUKA)
  1. Growth-associated emergence of spontaneous magnetization in Al-doped Cr2O3 thin film

    Tada Tatsuo, Sakurai Hiroki, Toyoki Kentaro, Ichikawa Satoshi, Ina Toshiaki, Kishida Noriaki, Kotani Yoshinori, Nakamoto Masashi, Mori Kota, Nakatani Ryoichi, Shiratsuchi Yu

    Acta Materialia Vol. 274 2024/08/01

  2. Giant gate modulation of antiferromagnetic spin reversal by the magnetoelectric effect

    Ujimoto Kakeru, Sameshima Hiroki, Toyoki Kentaro, Moriyama Takahiro, Nakamura Kohji, Kotani Yoshinori, Suzuki Motohiro, Iino Ion, Kawamura Naomi, Nakatani Ryoichi, Shiratsuchi Yu

    NPG Asia Materials Vol. 16 2024/04/05

  3. Direct observation and stochastic analysis on thermally activated nucleation and growth of individual magnetic domain

    Luo Fangfei, Toyoki Kentaro, Mitsumata Chiharu, Shen Jiaqi, Nakatani Ryoichi, Shiratsuchi Yu

    Journal of Magnetism and Magnetic Materials Vol. 587 2023/12/01

  4. Gate-induced switching of perpendicular exchange bias with very low coercivity in Pt/Co/Ir/Cr2O3/Pt epitaxial film

    Ekawa Hirofumi, Shen Jiaqi, Toyoki Kentaro, Nakatani Ryoichi, Shiratsuchi Yu

    Applied Physics Letters Vol. 122 No. 6 2023/02/06

  5. Increase of Néel temperature of magnetoelectric Cr₂O₃ thin film by epitaxial lattice matching

    Wang Xinrui, Ujimoto Kakeru, Toyoki Kentaro, Nakatani Ryoichi, Shiratsuchi Yu

    Applied Physics Letters Vol. 121 No. 18 2022/11/01

  6. Magnetic-field and temperature dependence of anomalous Hall effect in Pt/Cr₂O₃/Pt trilayer

    Wang Xinrui, Toyoki Kentaro, Nakatani Ryoichi, Shiratsuchi Yu

    AIP Advances Vol. 12 No. 3 2022/03/09

  7. Low pressure drive of the domain wall in Pt/Co/Au/Cr₂O₃/Pt thin films by the magnetoelectric effect

    Shen Jiaqi, Tada Tatsuo, Toyoki Kentaro, Kotani Yoshinori, Nakatani Ryoichi, Shiratsuchi Yu

    Applied Physics Letters Vol. 120 No. 9 2022/03/04

  8. Temperature lag with the onset of exchange bias, superparamagnetic blocking, and antiferromagnetic ordering in ultrathin ferromagnet/antiferromagnet thin film

    Shiratsuchi Yu, Tao Yiran, Tsutsumi Rou, Toyoki Kentaro, Nakatani Ryoichi

    Journal of Applied Physics Vol. 130 No. 19 2021/11/18

  9. Magnetic properties and magnetic domain observation of ndfeb sintered magnets treated by grain boundary diffusion process with dyal co-sorption

    Uenohara Masaru, Nishio Hiroaki, Toyoki Kentaro, Shiratsuchi Yu, Nakatani Ryoichi, Machida Ken-Ichi

    Materials Transactions Vol. 62 No. 8 p. 1216-1224 2021/08/01

  10. Magnetoelectric induced switching of perpendicular exchange bias using 30-nm-thick Cr₂O₃ thin film

    Shiratsuchi Yu, Tao Yiran, Toyoki Kentaro, Nakatani Ryoichi

    Magnetochemistry Vol. 7 No. 3 2021/03/09

  11. Robust magnetic domain of Pt/Co/Au/Cr₂O₃/Pt stacked films with a perpendicular exchange bias

    Shiratsuchi Yu, Yoshida Saori, Yoshida Hiroaki, Kotani Yoshinori, Toyoki Kentaro, Nakatani Ryoichi, Mitsumata Chiharu, Nakamura Tetsuya

    Journal of Applied Physics Vol. 127 No. 15 2020/04/15

  12. Observation of the magnetoelectric reversal process of the antiferromagnetic domain

    Shiratsuchi Yu, Watanabe Shunsuke, Yoshida Hiroaki, Kishida Noriaki, Nakatani Ryoichi, Kotani Yoshinori, Toyoki Kentaro, Nakamura Tetsuya

    Applied Physics Letters Vol. 113 No. 24 2018/12/13

  13. Antiferromagnetic domain wall creep driven by magnetoelectric effect

    Shiratsuchi Yu, Yoshida Hiroaki, Kotani Yoshinori, Toyoki Kentaro, Nguyen Thi Van Anh, Nakamura Tetsuya, Nakatani Ryoichi

    APL Materials Vol. 6 No. 12 2018/12/13

  14. Realization of a scanning soft X-ray microscope for magnetic imaging under high magnetic fields

    Kotani Yoshinori, Senba Yasunori, Toyoki Kentaro, Billington David, Okazaki Hiroyuki, Yasui Akira, Ueno Wakana, Ohashi Haruhiko, Hirosawa Satoshi, Shiratsuchi Yu, Nakamura Tetsuya

    Journal of Synchrotron Radiation Vol. 25 p. 1444-1449 2018/04/06

  15. Simultaneous achievement of high perpendicular exchange bias and low coercivity by controlling ferromagnetic/antiferromagnetic interfacial magnetic anisotropy

    Shiratsuchi Yu, Kuroda Wataru, Nguyen Thi Van Anh, Kotani Yoshinori, Toyoki Kentaro, Nakamura Tetsuya, Suzuki Motohiro, Nakamura Kohji, Nakatani Ryoichi

    Journal of Applied Physics Vol. 121 No. 7 2017/02/17

  16. Magnetoelectric switching of perpendicular exchange bias in Pt/Co/α-Cr₂O₃/Pt stacked films

    Toyoki Kentaro, Shiratsuchi Yu, Kobane Atsushi, Mitsumata Chiharu, Kotani Yoshinori, Nakamura Tetsuya, Nakatani Ryoichi

    Applied Physics Letters Vol. 106 No. 16 2015/04/22

  17. Switching of perpendicular exchange bias in Pt/Co/Pt/α-Cr₂O₃/Pt layered structure using magneto-electric effect

    Toyoki Kentaro, Shiratsuchi Yu, Kobane Atsushi, Harimoto Shotaro, Onoue Satoshi, Nomura Hikaru, Nakatani Ryoichi

    Journal of Applied Physics Vol. 117 No. 17 2015/01/16

  18. 電気磁気効果を発現するCo/α-Cr2O3積層膜における交換バイアス反転機構

    豊木 研太郎