Formation of pseudo-morphic domain in Cr2O3(0001) epitaxial film grown on α-Al2O3(0001) and its effect on Néel temperature
Horofumi Ekawa, Hiroki Sameshima, Kentaro Toyoki, Ryoichi Nakatani and Yu Shiratsuchi Japanese Journal of Applied Physics, 09SP33 (8 pp) (2024).
[Selected as "Spotlight paper"]
Features of itinerant magnetism in Fe0.6Al0.4 film with B2-like short-range-order
Kentaro Toyoki, Daigo Kitaguchi, Yutaro Yamashita, Yoshinori Kotani, Yu Shiratsuchi and Ryoichi Nakatani Japanese Journal of Applied Physics, 10SP03 (7 pp) (2024).
Origin of Perpendicular Magnetic Anisotropy in Fe0.6Al0.4/Cr0.8Al0.2 Metallic Superlattice
Kentaro Toyoki, Takehiro Minami, Yu Shiratsuchi and Ryoichi Nakatani Japanese Journal of Applied Physics, Vol. 63, pp. 09SP032 (7 pp) (2024).
Structural investigations of cargo molecules inside icosahedrally symmetric encapsulin by VUVCD spectroscopic measurements
Shiori Kumamoto, Akima Yamamoto, Yu Shiratsuchi, Koichi Matsuo, Akifumi Higashiura and Daisuke Hira Chirality, Vol. 36, pp. e23700 (8 pp) (2024).
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 and Yu Shiratsuchi Acta Materialia, Vol. 274, pp. 120027 (11 pp) (2024).
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 and Yu Shiratsuchi NPG Asia Materials, Vol. 16, pp. 20 (11 pp) (2024).[Press Release]
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 and Ryoichi Nakatani Journal of Physics, Condensed Matter., Vol. 36, pp. 135805 (10 pp) (2024).
Strain-induced specific orbital control in a Heusler-alloy-based interfacial multiferoics
Jun Okabayashi, Takamasa Usami, Amran Mahfudh Yatmeidhy, Yuichi Murakami, Yu Shiratsuchi, Ryoichi Nakatani, Yoshihiro Gohda, and Kohei Hamaya NPG Asia Materials, Vol. 16, pp. 3 (10 pp) (2024).[Press Release]
表彰 / Awards
2023年度日本鉄鋼協会・日本金属学会 関西支部 材料物性工学談話会 優秀講演賞 鮫島 寛生
2023年度日本鉄鋼協会・日本金属学会 関西支部 材料物性工学談話会 優秀講演賞 中村 圭伸
第27回 半導体におけるスピン工学の基礎と応用(PASPS-27) 優秀ポスター賞 鮫島 寛生
2023年
論文 / Original Papers & Conference Paper
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, and Yu Shiratsuchi Journal of Magnetism and Magnetic Materials, Vol. 587, pp. 171228 (9 pp) (2023).
Direct observation of antiferromagnetic domains and field-induced reversal in Pt/Cr2O3/Pt epitaxial trilayer
Kakeru Ujimoto, Hiroki Sameshima, Kentaro Toyoki, Takahiro Moriyama, Kohji Nakamura, Yoshinori Kotani, Ryoichi Nakatani,and Yu Shiratsuchi Applied Physics Letters, Vol. 123, pp. 022407 (7 pp) (2023) .
Magnetic interaction in superparamagnetic Co-Pt nanoparticles synthesized in protein crystal
Kakeru Tagata, Daisuke Kanda, Naoto Kobayashi, Akifumi Higashiura, Satoshi Ichikawa, Noriaki Kishida, Ryoichi Nakatani, Atsushi Nakagawa, and Yu Shiratsuchi IEEE Transaction on Magnetics, Vol. 59, Issue 11, pp. 2300105 (5 pp) (2023).
Gate-induced switching of perpendicular exchange bias with very low coercivity in Pt/Co/Ir/Cr2O3/Pt thin film
Hirofumi Ekawa, Jiaqi Shen, Kentaro Toyoki, and Ryoichi Nakatani, Yu Shiratsuchi Applied Physics Letters, Vol. 122, pp. 063404 (7 pp) (2023).
Anomalous Hall effect in Pt/Al-doped Cr2O3 epitaxial film
Ion Iino, Tatsuo Tada, Kentaro Toyoki, Ryoichi Nakatani and Yu Shiratsuchi AIP Advances, Vol. 13, pp. 013035 (6 pp) (2023).
Peculiar temperature depenence of magneto-optic Kerr rotation associated with antiferromagnetic-paramagnetic toransition
Hirofumi Ekawa, Takashi Okano, Oujin Huang, Ion Iino, Kentaro Toyoki, Ryoichi Nakatani, Takeshi Kato, and Yu Shiratsuchi Japanese Journal of Applied Physics, Vol.62, pp. SB1002 (6 pp) (2023).
Frequency dependence of coercivity in Nickel and Co-Fe-B thin film for DC to 100 kHz region
Kentaro Toyoki, Shunya Matsui, Yu Shiratsuchi, Yasushi Endo and Ryoichi Nakatani Japanese Journal of Applied Physics, Vol.62, pp. SB1008 (6 pp) (2023).
Converse magnetoelectic effect coefficient greater than 10-6 s/m in perpendicularly magnetized Co/Pd multilayers on Pb(Mg1/3Nb2/3)O3-PbTiO3
Takamasa Usami, Yuma Sanada, Yu Shiratsuchi, Shinya. Yamada, Takeshi Kanashima, Ryoichi Nakatani and Kohei Hamaya Journal of Magnetism and Magnetic Materials, Vol. 570, pp. 170532 (6 pp) (2023).
Metastable Co3Mn/Fe/Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructures
Y. Murakami, T. Usami, R. Watarai, Y. Shiratsuchi, T. Kanashima, R. Nakatani, Y. Gohda and K. Hamaya Journal of Applied Physics, Vol. 134, pp. 224101 (10 pp) (2023).
Finite size effect and dimensional crossover in antiferromagnetic epitaxial Cr2O3 thin films
Hiroki Sameshima, Kakeru Ujimoto, Rou Tsutsumi, Kentaro Toyoki, Ryoichi Nakatani, and Yu Shiratsuchi 2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers).
Growth and magnetoelectric effect of epitaxial Co3Mn films on piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3(001)
Yuichi Murakamu, Takamasa Usami, Yu Shiratsuchi, Yuya Sanada, Shinya Yamada, Ryoichi Nakatani and Kohei Hamaya 2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers).
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 and Ryoichi Nakatani 2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers).
Increase of Néel temperature of magnetoelectric Cr2O3 thin film by epitaxial lattice matching
Xunrui Wang, Kakeru Ujimoto, Kentaro Toyoki, Ryoichi Nakatani and Yu Shiratsuchi Applied Physics Letters, Vol. 121, pp. 182404 (6 pp) (2022). https://aip.scitation.org/doi/full/10.1063/5.0116968
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, pp. 110840 (6 pp) (2022). https://doi.org/10.1016/j.jpcs.2022.110840
Giant converse magnetoelectric effect in a multiferroic heterostructure with polycrystalline Co2FeSi
Shumpei Fujii, Takamasa Usami, Yu Shiratsuchi, Ireene Azaceta, Adam Krrigan, Amran Mahfudh Yatmeidhy, Shinya Yamada, Takeshi Kanashima, Ryoichi Nakatani, Vlado K. Lazarov, Tamio Oguchi, Yoshihiro Gohda, and Kohei Hamaya NPG Asia Materials, Vol. 14, pp. 43(11 pp) (2022). https://doi.org/10.1038/s41427-022-00389-1
Low pressure drive of domain wall in Pt/Co/Au/Cr2O3/Pt thin film by magnetoelectric effect
Jiaqi Shen, Tatsuo Tada, Kentaro Toyoki, Yoshinori Kotani, Ryoichi Nakatani, and Yu Shiratsuchi Applied Physics Letters, Vol. 120, pp. 092404(6 pp) (2022). https://doi.org/10.1063/5.0083202
Magentic-field and temperature dependence of anomalous Hall effect in Pt/Cr2O3/Pt trilayer
Xinrui Wang, Kentaro Toyoki, Ryoichi Nakatani, and Yu Shiratsuchi AIP Advances, Vol. 12, pp. 035216(5 pp) (2022). https://doi.org/10.1063/9.0000253
Converse magnetoelectric effect in epitaxial Co2MnSi/Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructures: Comparison of L21- and B2-orderd Co2MnSi
Takamasa Usami, Shumpei Fujii, Shinya Yamada, Yu Shiratsuchi, Takeshi Kageshima, Ryoichi Nakatani and Kohei Hamaya IEEE Tranaction on Magnetics, Vol. 58, Art N0.2501505, (2022). https://doi.org/10.1109/TMAG.2022.3145521
Significant effect of interfacial spin moment in ferromagnet-semiconductor heterojunction on spin transport in a semiconductor
Takahiro Naito, Rintaro Nishimura, Michihiro Yamada, Akira Masago, Yu Shiratsuchi, Yuya Wagatsuma, Kentaro Sawano, Ryoichi Nakatani, Tamio Oguchi and Kohei Hamaya Physical Review B, Vol. 105, Art N0.195308, (2022). https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.195308
Dominant carrier of pseudo gap antiferromagnet Cr3Al thin film
Kentaro Toyoki, Masayuki Hayashi, Shunsuke Hamaguchi, Shotaro Harimoto, Yu Shiratsuchi, Takafumi Ishibe, Yoshiaki Nakamura, and Ryoichi Nakatani Physica B: Physics of Condesed Matter, Vol. 620, pp. 413281 (8 pp) (2021).
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 and Ryoichi Nakatani Journal of Applied Physics, Vol. 130, Issue 19, pp. 193902 (2021)
Structural, magnetic, and electric properties of Pt/Co/Au/Cr2O3/Pt thin film with Cr2O3 layer below 25 nm
Yu Shiratsuchi (corr. author), Janqi Shen, Yiran Tao, Kohei Takahara, Kentaro Toyoki and Ryoichi Nakatani Journal of Magnetics Society of Japan, Vol. 45, No. 4, pp. 101-105 (2021).
Magnetic Properties and Magnetic Domain Observation of Nd-Fe-B Sintered Magnets Treated by Grain Boundary Diffusion Process with Dy-Al Co-Sorption
Masaru Uenohara, Hiroaki Nishio, Kentaro Toyoki, Yu Shiratsuchi, Ryoichi Nakatani and Ken-ichi Machida Materials Transaction, Vol. 62, No. 8, pp. 1216 - 1224 (2021).
Effect of Fe atomic layers on the ferromagnet-semiconductor interface on temperature-dependent spin transport in semiconductors
Michihiro Yamada, Yu Shiratsuchi, H. Kambe, Kohei Kudo, Shinya Yamada, Kentarou Sawano, Ryoichi Nakatani, and Kohei Hamaya Journal of Applied Physics, Vol. 129, pp. 183901(7 pp) (2021).
Giant magnetoelectric effect in an L21-ordered Co2FeSi/Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructure
T. Usami, S. Fujii, Y. Shiratsuchi, R. Nakatatani and K. Hamaya Applied Physics Letters, Vol. 118, 42402 (5pp) (2021).
Magnetoelectric control of antiferromagnetic domain state in Cr2O3 thin film [Topical Review]
Yu Shiratsuchi, Kentaro Toyoki and Ryoichi Nakatani J. Phys. Condens. Matter, Vol. 33, pp. 243001 (18pp) (2021).
Magnetoelectric Induced Switching of Perpendicular Exchange Bias Using 30-nm-Thick Cr2O3 Thin Film [Selected as Journal issue cover]
Yu Shiratsuchi, Yiran Tao, Kentaro Toyoki and Ryoichi Nakatani Magnetochemistry, Vol. 7, pp. 36(10 pp) (2021).
2020年
論文 / Original Papers
Robust magnetic domain in Pt/Co/Au/Cr2O3/Pt stacked film with perpendicular exchange bias
Yu Shiratsuchi, Saori Yoshida, Hiroaki Yoshida, Yoshinori Kotani, Kentaro Toyoki, Chiharu Mitsumata, Ryoichi Nakatani and Tetsuya Nakamura Journal of Applied Physics, Vol. 127, Issue 15, pp. 153902(7 pp) (2020).
Giant anomalous Hall conductivity at Pt/Cr2O3 interface
Takahiro Moriyama , Yu Shiratsuchi, Tatsuya Iino, Hikaru Aono, Motohiro Suzuki, Tetsuya Nakamura, Yoshinori Kotani, Ryoichi Nakatani, Kohji Nakamura, and Teruo Ono Physical Review Applied, Vol. 13, No. 3, pp.034052(8 pp) (2020).
Realization of magnetoelectric effect in 50-nm-thick Cr2O3 thin film
Yu Shiratsuchi, Kentaro Toyoki, Tao Yiran, Hikaru Aono and Ryoichi Nakatani Applied Physics Express, Vol. 13, pp. 043003(4 pp) (2020)
Critical behavior of perpendicular exchange bias in Pd/Co/Pt/Cr2O3/Pd stacked films
Yu Shiratsuchi, Motohiro Suzuki, Kentaro Toyoki, Kohei Wakatsu, Takashi Nishimura, Tetsuya Nakamura and Ryoichi Nakatani Physica B: Physics of Condesed Matter, Vol. 583, pp. 412052 (5pp) (2020).
Magnetic properties of Co film in Pt/Co/Cr2O3/Pt structure
Thi Van Anh Nguyen, Yu Shiratsuchi, Hideo Sato, Shoji Ikeda, Tetsuo Endoh, and Yasushi Endo AIP Advances, Vol. 19, 015152(6 pp) (2020).
Regeneration of perpendicular exchange bias in high temperature regime in Pt/Co/Au/Cr2O3/Pt stacked films
Yu Shiratsuchi, Daisuke Tokunaga and Ryoichi Nakatani Japanese Journal of Applied Physics, Vol. 59,SEEF02 (7 pp) (2020).
2019年
論文 / Original Papers
Enhancement of perpendicular exchange bias by introducing twin boundary in Pt/Co/α-Cr2O3/α-V2O3 epitaxial film
Yu Shiratsuchi, Saori Yoshida, Satoshi Onoue, Chiharu Mitsumata, Nobuhito Inami, Tetsuro Ueno, Kanta Ono and Ryoichi Nakatani Materials Transactions, Vol. 60, No. 9, pp. 2028 - 2032 (2019).
Resistive detection of the Néel temperature of Cr2O3 thin film
Tatsuya Iino, Takahiro Moriyama, Hiroyuki Iwaki, Hikaru Aono, Yu Shiratsuchi and Teruo Ono Applied Physics Letters, Vol. 114, pp. 022402 (2019).
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 Koatani, Shogo Kawaguchi, Kunihisa Sugimoto, Kentaro Toyoki, Tomoki Fukunaga, Takeshi Nishiuchi, Kazuhiro Hono, Satoshi Hirosawa and Tetsuya nakamura Acta Materialia, Vol. 181, pp. 530-536 (2019).
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. 181, pp. 530-536 (2019).
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, and Yoshishige Suzuki Physical Review B, Vol. 99, pp. 184421 (2019).
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, pp. 1-9 (2019).
Frustration and relaxation of antiferromagnetic domains reversed by magneto-electric field cooling [Editor's Pick]
Yu Shiratsuchi, Shunsuke Watanabe, Shogo Yonemura, Tatsuo Shibata and Ryoichi Nakatani AIP Advances, Vol. 8, Issue 12 (2018) 125313.
Antiferromagnetoic domain wall creep driven by magnetoelectric effect
Yu Shiratsuchi, Hiroaki Yoshida, Yoshinori Kotani, Kentaro Toyoki, Thi Van Anh Nguyen, Tetsuya Nakamura and Ryoichi Nakatani APL Materials, Vol. 6, (2018) 121104.
Obsevation of the magnetoelectric reversal process of the antiferromagnetic domain
Yu Shiratsuchi, Shunsuke Watanabe, Hiroaki Yoshida, Noriaki Kishida, Ryoichi Nakatani, Yoshinori Kotani, Kentaro Toyoki and Tetsuya Nakamura Applied Physics Letters, Vol. 113, Issue 24 (2018) 242404.
Energy condition of isothermal magnetoelectric switching of perpendicular exchange bias in Pt/Co/Au/Cr2O3/Pt stacked films [Editor's Pick]
Thi Van Ahn Nguyen, Yu Shiratsuchi, Shogo Yonemura, Tatsuo Shibata and Ryoichi Nakatani Journal of Applied Physics, Vol. 123, Issue 23 (2018) 233902.
Development of scanning soft X-ray microscipe 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 and Tetsuya Nakamura Journal of Synchrotron Raddiation, Vol. 25 (2018) 1444.
Determination of specific ion position of Cr3+ and O2- in Cr2O3 thin film and their relationship to exchange anisotropy at Co/Cr2O3 interface
Yu Shiratsuchi, Yuuta Nakano, Nobuhito Inami, Tetsuro Ueno, Kanta Ono, Reiji Kumai, Ryoko Sagayama and Ryoichi Nakatani Journal of Applied Physics, Vol. 123 (2018) 103903.
Magnetoelectric control of antiferromagnetic domain state of Cr2O3 thin film toward spintronic application
Yu Shiratsuchi and Ryoichi Nakatani Journal of Magnetics Society of Japan, Vol. 42, No. 6 (2018) 119.
Stabke contrast mode on TiO2(110) surface with metal-coated tip using AFM
Y. J. Li, H. Wen, Q. Zhang, Y. Adachi, E. Arima, Y. Kinoshita, H. Nomura, Z. Ma, L. Kou, Y. Tsukuda, Y. Naitoh, Y. Sugawara, R. Xu and Z. Cheng Ultramicroscopy, Vol. 191 (2018) 51.