Polarized and Unpolarized Neutron Scattering for Magnetic Materials at the Triple-axis Spectrometer PONTA in JRR-3

• Taro Nakajima, Hiraku Saito, Naoki Kobayashi, Takuro Kawasaki, Tatsuya Nakamura, Hazuki Kawano-Furukawa, Shinichiro Asai, and Takatsugu Masuda

• J. Phys. Soc. Jpn. 93, 091002 (2024).

• SPECIAL TOPICS: Restart of JRR-3 and Frontier Science of Reactor-Neutron

• Instrument:  5G-PONTA(JRR-3)

Non-coplanar helimagnetism in the layered van-der-Waals metal DyTe3

• Shun Akatsuka, Sebastian Esser, Shun Okumura, Ryota Yambe, Rinsuke Yamada, Moritz M. Hirschmann, Seno Aji, Jonathan S. White, Shang Gao, Yoshichika Onuki, Taka-hisa Arima, Taro Nakajima, Max Hirschberger 

• Nat. Commun. 15, 4291 (2024).

• arXiv:2306.04854

• Instrument:  5G-PONTA(JRR-3)

Stroboscopic Time-of-Flight Neutron Diffraction in Long Pulsed Magnetic Fields

• Taro Nakajima, Masao Watanabe, Yasuhiro Inamura, Kazuki Matsui, Tomoki Kanda, Tetsuya Nomoto, Kazuki Ohishi, Yukihiko Kawamura, Hiraku Saito, Hiromu Tamatsukuri, Noriki Terada, Yoshimitsu Kohama

• Phys. Rev. Research 6, 023109 (2024).

• arxiv:2308.11097

• Instrument:  TAIKAN(J-PARC)

Multi-step topological transitions among meron and skyrmion crystals in a centrosymmetric magnet

• H. Yoshimochi, R. Takagi, J. Ju, N. D. Khanh, H. Saito, H. Sagayama, H. Nakao, S. Itoh, Y. Tokura, T. Arima, S. Hayami, T. Nakajima, S. Seki

• Nat. Phys. (2024)

• arXiv:2402.13751

• Press release : 多彩なスピン構造の間のトポロジカル数スイッチングに成功 - 超高密度な新しい情報担体としての活用に期待 -

• Instruments:  HRC(J-PARC), BL-3A(Photon Factory)

Sample Environment of the HRC Spectrometer at J-PARC

• Daichi Ueta, Shinichi Itoh, Takatsugu Masuda, Tetsuya Yokoo, Taro Nakajima, Shinichiro Asai, Hiraku Saito, Daichi Kawana, Ryosuke Sugiura, Toshio Asami, Sara Yamauchi, Shuki Torii, Yoshiaki Ihata, and Hiroaki Tanino

• JPS Conf. Proc. 41, 011008 (2024).

• Instrument: HRC (J-PARC)

Development of Polarization Analysis at TAIKAN under Magnetic Field at Low Temperature

• Toshiaki Morikawa, Kazuki Ohishi, Kosuke Hiroi, Yukihiko Kawamura, Shin-ichi Takata, Jun-ichi Suzuki, and Taro Nakajima

• JPS Conf. Proc. 41, 011012 (2024).

• Instrument: TAIKAN (J-PARC)

Polarized Neutron Diffraction Study on UPt2Si2

• Fusako Kon, Chihiro Tabata, Hiraku Saito, Taro Nakajima, Hiroyuki Hidaka, Tatsuya Yanagisawa Hiroshi Amitsuka

• J. Phys. Soc. Jpn., 93, 044701 (2024).

• arXiv.2312.12718

• Instrument: 5G-PONTA(JRR-3)

Colossal negative magnetoresistance in field-induced Weyl semimetal of magnetic half-Heusler compound

• Kentaro Ueda, Tonghua Yu, Motoaki Hirayama, Ryo Kurokawa, Taro Nakajima, Hiraku Saito, Markus Kriener, Manabu Hoshino, Daisuke Hashizume, Taka-hisa Arima, Ryotaro Arita, Yoshinori Tokura 

• Nat. Commun. 14, 6339 (2023)

• Instrument:  5G-PONTA(JRR-3)

In-plane anisotropy of the single-q and multiple-q ordered phases in the antiferromagnetic metal CeRh2Si2

• Hiraku Saito, Fusako Kon, Hiroyuki Hidaka, Hiroshi Amitsuka, Cho Kwanghee, Masato Hagihala, Takashi Kamiyama, Shinichi Itoh, Taro Nakajima

• Phys. Rev. B 108, 094440 (2023).

• arXiv.2306.11284

• Instruments:  5G-PONTA(JRR-3), HRC(J-PARC), SuperHRPD(J-PARC)

Direct observations of spin fluctuations in spin-hedgehog-anti-hedgehog lattice states in MnSi1−xGex (x=0.6 and 0.8) at zero magnetic field

• Seno Aji, Tatsuro Oda, Yukako Fujishiro, Naoya Kanazawa, Hiraku Saito, Hitoshi Endo, Masahiro Hino, Shinichi Itoh, Taka-hisa Arima, Yoshinori Tokura, Taro Nakajima

• Phys. Rev. B 108, 054445 (2023).

• arXiv:2305.01172

• Instruments: HRC(J-PARC), VIN ROSE(J-PARC)

Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials

• H. Takagi, R. Takagi, S. Minami, T. Nomoto, K. Ohishi, M.-T. Suzuki, Y. Yanagi, M. Hirayama, N. D. Khanh, K. Karube, H. Saito, D. Hashizume, R. Kiyanagi, Y. Tokura, R. Arita, T. Nakajima, S. Seki

• Nature Physics 19, 961-968 (2023).

• Press release : 「反強磁性体におけるトポロジカルホール効果の実証に成功 - 磁気情報の新しい読み出し手法としての活用に期待 - 」

• Instruments : 5G-PONTA(JRR-3), TAIKAN(J-PARC), SENJU(J-PARC)

Crystal electric field level scheme leading to giant magnetocaloric effect for hydrogen liquefaction

• Noriki Terada, Hiroaki Mamiya, Hiraku Saito, Taro Nakajima, Takafumi D. Yamamoto, Kensei Terashima, Hiroyuki Takeya, Osamu Sakai, Shinichi Itoh, Yoshihiko Takano, Masashi Hase & Hideaki Kitazawa 

• Commun Mater 4, 13 (2023). 

• Instruments: HRC(J-PARC)

Polarized neutron scattering study on the centrosymmetric skyrmion host material Gd2PdSi3

• Jiwon Ju, Hiraku Saito, Takashi Kurumaji, Max Hirschberger, Akiko Kikkawa, Yasujiro Taguchi, Taka-hisa Arima, Yoshinori Tokura, Taro Nakajima

• Phys. Rev. B 107, 024405 (2023).

• http://arxiv.org/abs/2208.08188

• Instruments: 5G-PONTA(JRR-3)

Square and rhombic lattices of magnetic skyrmions in a centrosymmetric binary compound. 

• Rina Takagi, Naofumi Matsuyama, Victor Ukleev, Le Yu, Jonathan S. White, Sonia Francoual, José R. L. Mardegan, Satoru Hayami, Hiraku Saito, Koji Kaneko, Kazuki Ohishi, Yoshichika Ōnuki, Taka-hisa Arima, Yoshinori Tokura, Taro Nakajima & Shinichiro Seki

• Nat Commun 13, 1472 (2022).

• Press release: 「超高密度な磁気渦を示すシンプルな二元合金物質を発見 －次世代磁気メモリへの応用に期待－」

Zoology of Multiple-Q Spin Textures in a Centrosymmetric Tetragonal Magnet with Itinerant Electrons

• Nguyen Duy Khanh, Taro Nakajima, Satoru Hayami, Shang Gao, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Rina Takagi, Yukitoshi Motome, Yoshinori Tokura, Taka-hisa Arima, Shinichiro Seki

• Adv. Sci. 9, 2105452 (2022).

Above-ordering-temperature large anomalous Hall effect in a   triangular-lattice magnetic semiconductor

• Masaki Uchida, Shin Sato, Hiroaki Ishizuka, Ryosuke Kurihara, Taro Nakajima, Yusuke Nakazawa, Mizuki Ohno, Markus Kriener, Atsushi Miyake, Kazuki Ohishi, Toshiaki Morikawa, Mohammad Saeed Bahramy, Taka-hisa Arima, Masashi Tokunaga, Naoto Nagaosa, Masashi Kawasaki

• Sci. Adv. 7, abl5381 (2021).

• Press release: 「巨大な磁場応答を示す三角格子磁性半導体 －三拍子揃った稀有な磁性材料の発見－」

Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi

• Yusuke Ohtsuka, Naoya Kanazawa, Motoaki Hirayama, Akira Matsui, Takuya Nomoto, Ryotaro Arita, Taro Nakajima, Takayasu Hanashima, Victor Ukleev, Hiroyuki Aoki, Masataka Mogi, Kohei Fujiwara, Atsushi Tsukazaki, Masakazu Ichikawa, Masashi Kawasaki, Yoshinori Tokura

• Sci. Adv. 7, eabj0498 (2021).

• arxiv: 2104.12438

• Press release: 「鉄シリコン化合物における新しいトポロジカル表面状態 －ありふれた元素を用いたスピントロニクス機能の実現－」

Robust noncoplanar magnetism in band-filling-tuned (Nd1-xCax)2Mo2O7

• Max Hirschberger, Yoshio Kaneko, Leonie Spitz, Taro Nakajima, Yasujiro Taguchi, and Yoshinori Tokura

• Phys. Rev. B 104, 024436 (2021).

Phase correction method in a wide detector plane for MIEZE spectroscopy with pulsed neutron beams

• Tatsuro Oda, Hitoshi Endo, Hidetoshi Ohshita, Tomohiro Seya, Yoshiji Yasu, Taro Nakajima, Masahiro Hino, Yuji Kawabata

• Nuclear Instruments and Methods in Physics Research Section A, 1012, 165616 (2021).

Direct Observation of Cycloidal Spin Modulation and Field-induced Transition in Néel-type Skyrmion-hosting VOSe2O5

• Takashi Kurumaji, Taro Nakajima, Artem Feoktystov, Earl Babcock, Zahir Salhi, Victor Ukleev , Taka-hisa Arima, Kazuhisa Kakurai, and Yoshinori Tokura. 

• J. Phys. Soc. Jpn. 90, 024705 (2021) [Open select]. 

Crystallization of magnetic skyrmions in MnSi investigated by neutron spin echo spectroscopy

• Taro Nakajima, Tatsuro Oda, Masahiro Hino, Hitoshi Endo, Kazuki Ohishi, Kazuhisa Kakurai, Akiko Kikkawa, Yasujiro Taguchi, Yoshinori Tokura, and Taka-hisa Arima

• Phys. Rev. Research 2, 043393 (2020).

Highly tunable topological system based on PbTe-SnTe binary alloy

• Cheng-Long Zhang, Tian Liang, Naoki Ogawa, Yoshio Kaneko, Markus Kriener, Taro Nakajima, Yasujiro Taguchi, and Yoshinori Tokura

• Phys. Rev. Mat. 4, 091201 (2020). 

Topological Nernst Effect of the Two-Dimensional Skyrmion Lattice

• Max Hirschberger, Leonie Spitz, Takuya Nomoto, Takashi Kurumaji, Shang Gao, Jan Masell, Taro Nakajima, Akiko Kikkawa, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Yasujiro Taguchi, Ryotaro Arita, Taka-hisa Arima, and Yoshinori Tokura

• Phys. Rev. Lett. 125, 076602 (2020). 

High-field depinned phase and planar Hall effect in the skyrmion host Gd2PdSi3

• Max Hirschberger, Taro Nakajima, Markus Kriener, Takashi Kurumaji, Leonie Spitz, Shang Gao, Akiko Kikkawa, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Seiko Ohira-Kawamura, Yasujiro Taguchi, Taka-hisa Arima, and Yoshinori Tokura

• Phys. Rev. B 101, 220401(R) (2020). 

Nanometric square skyrmion lattice in a centrosymmetric tetragonal magnet

• Nguyen Duy Khanh, Taro Nakajima, Xiuzhen Yu, Shang Gao, Kiyou Shibata, Max Hirschberger, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Licong Peng, Kiyomi Nakajima, Rina Takagi, Taka-hisa Arima, Yoshinori Tokura, Shinichiro Seki 

• Nat. Nanotech. 15, 444 (2020).

• Press release : 新機構が生み出す過去最小の磁気渦粒子を発見 (東京大学大学院 工学系研究科)

Monoclinic semimetal IrSi synthesized under high pressure above 25 GPa: Crystal structure, electronic, and magnetic properties

• Y. Fujishiro, N. Kanazawa, T. Shinmei, M. Nishi, T. Nakajima, T. Arima, D. Hashizume, M. S. Bahramy, T. Irifune, and Y. Tokura

• Phys. Rev. Materials 4, 055002 (2020). [Editors' Suggestion]

Emergent topological spin structures in the centrosymmetric cubic perovskite SrFeO3

• S. Ishiwata, T. Nakajima, J.-H. Kim, D. S. Inosov, N. Kanazawa, J. S. White, J. L. Gavilano, R. Georgii, K. M. Seemann, G. Brandl, P. Manuel, D. D. Khalyavin, S. Seki, Y. Tokunaga, M. Kinoshita, Y. W. Long, Y. Kaneko, Y. Taguchi, T. Arima, B. Keimer, and Y. Tokura

• Phys. Rev. B 101, 134406 (2020). [Editors' Suggestion]

Stability of multiferroic phase and magnetization-polarization coupling in Y-type hexaferrite crystals

• V. Kocsis, T. Nakajima, M. Matsuda, A. Kikkawa, Y. Kaneko, J. Takashima, K. Kakurai, T. Arima, Y. Tokunaga, Y. Tokura, and Y. Taguchi

• Phys. Rev. B 101, 075136 (2020). 

Ordering phenomena of spin trimers accompanied by a large geometrical Hall effect

• Shang Gao, Max Hirschberger, Oksana Zaharko, Taro Nakajima, Takashi Kurumaji, Akiko Kikkawa, Junichi Shiogai, Atsushi Tsukazaki, Shojiro Kimura, Satoshi Awaji, Yasujiro Taguchi, Taka-hisa Arima, and Yoshinori Tokura

• Phys. Rev. B 100, 241115(R) (2019). [Editors' suggestion]

Skyrmion phase and competing magnetic orders on a breathing kagomé lattice, 

• Max Hirschberger, Taro Nakajima, Shang Gao, Licong Peng, Akiko Kikkawa, Takashi Kurumaji, Markus Kriener, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Kazuki Ohishi, Kazuhisa Kakurai, Yasujiro Taguchi, Xiuzhen Yu, Taka-hisa Arima & Yoshinori Tokura 

•  Nat. Commun.  10, 5831 (2019). 

Correlation between site occupancies and spin-glass transition in skyrmion host Co10-x/2Zn10-x/2Mnx

•  T. Nakajima, K. Karube, Y. Ishikawa, M. Yonemura, N. Reynolds, J. S. White, H. M. Rønnow, A. Kikkawa, Y. Tokunaga, Y. Taguchi, Y. Tokura, and T. Arima, 

• Phys. Rev. B 100, 064407 (2019). 

Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet

•  Takashi Kurumaji, Taro Nakajima, Max Hirschberger, Akiko Kikkawa, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Yasujiro Taguchi, Taka-hisa Arima, Yoshinori Tokura, 

• Science 365, 914-918 (2019), 

• Press release : ナノ磁気渦形成の定説を覆す物質の開発に成功－磁気フラストレーションを利用して創発電磁気応答を巨大化－]

Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators

• Masataka Mogi, Taro Nakajima, Victor Ukleev, Atsushi Tsukazaki, Ryutaro Yoshimi, Minoru Kawamura, Kei S. Takahashi, Takayasu Hanashima, Kazuhisa Kakurai, Taka-hisa Arima, Masashi Kawasaki, and Yoshinori Tokura, 

• Phys. Rev. Lett. 123, 016804 (2019),  

• arXiv:1906.02159

Observation of Magnetic Skyrmions by Neutron Scattering

• Taro Nakajima and Taka-hisa Arima, 

• J. Phys. Soc. Jpn. 88, 081006 (2019). [SPECIAL TOPICS: New Frontiers in Physics with Spin, Orbital, and Atomic Correlations Using Neutron Scattering]

 Magnetization-polarization cross-control near room temperature in hexaferrite single crystals

• V. Kocsis, T. Nakajima, M. Matsuda, A. Kikkawa, Y. Kaneko, J. Takashima, K. Kakurai, T. Arima, F. Kagawa, Y. Tokunaga, Y. Tokura and Y. Taguchi, 

• Nat. Commun. 10, 1247 (2019), 

• Press release : 室温近傍での電場による磁化制御－低消費電力の電圧制御磁気メモリの実現に道筋－

Topological transitions among skyrmion- and hedgehog-lattice states in cubic chiral magnets

• Y. Fujishiro, N. Kanazawa, T. Nakajima, X. Z. Yu, K. Ohishi, Y. Kawamura, K. Kakurai, T. Arima, H. Mitamura, A. Miyake, K. Akiba, M. Tokunaga, A. Matsuo, K. Kindo, T. Koretsune, R. Arita & Y. Tokura, 

• Nat. Commun. 10, 1059 (2019).

• Press release : 相転移の狭間に出現する新たな創発磁気モノポール格子 -二つのトポロジカル磁気構造が移り変わる様子を解明-

Uniaxial-stress effects on helimagnetic orders and skyrmion lattice in Cu2OSeO3,

•  Taro Nakajima, Victor Ukleev, Kazuki Ohishi, Hiroshi Oike, Fumitaka Kagawa, Shin-ichiro Seki, Kazuhisa Kakurai, Yoshinori Tokura, and Taka-hisa Arima, 

• J. Phys. Soc. Jpn. 87, 094709 (2018).

 Phase-transition kinetics of magnetic skyrmions investigated by stroboscopic small-angle neutron scattering, 

• Taro Nakajima, Yasuhiro Inamura, Takayoshi Ito, Kazuki Ohishi, Hiroshi Oike, Fumitaka Kagawa, Akiko Kikkawa, Yasujiro Taguchi, Kazuhisa Kakurai, Yoshinori Tokura, and Taka-hisa Arima.

• Phys. Rev. B 98, 014424 (2018), 

• Press release : プレスリリース：磁気渦の生成・消滅過程を100分の1秒単位で観測－J-PARC MLFのパルス中性子を用いたストロボ撮影に成功－

Unveiling structural, chemical and magnetic interfacial peculiarities in ε-Fe2O3/GaN (0001) epitaxial films 

• Victor Ukleev, Sergey Suturin, Taro Nakajima, Taka-hisa Arima, Thomas Saerbeck, Takayasu Hanashima, Alla Sitnikova, Demid Kirilenko, Nikolai Yakovlev, Nikolai Sokolov, 

• Sci. Rep. 8, 8741 (2018).

Magnetic field tunable dielectric dispersion in successive field-induced magnetic phases of the geometrically frustrated magnet CuFeO2 up to 28 T

•  H. Tamatsukuri, S. Mitsuda, K. Hiroura, T. Nakajima, M. Fujihala, M. Yamano, Y. Toshioka, C. Kaneko, K. Takehana, Y. Imanaka, N. Terada, and H. Kitazawa

• Phys. Rev. B 97, 214407 (2018).

N'eel-type Skyrmion lattice in the tetragonal polar magnet VOSe2O5 

• Takashi Kurumaji, Taro Nakajima, Victor Ukleev, Artem Feoktystov, Taka-hisa Arima, Kazuhisa Kakurai, and Yoshinori Tokura 

• Phys. Rev. Lett. 119, 237201 (2017).

 Superconductivity at the polar-nonpolar phase boundary of SnP with an unusual valence state

• M. Kamitani, M. S. Bahramy, T. Nakajima, C. Terakura, D. Hashizume, T. Arima, and Y. Tokura 

• Phys. Rev. Lett. 119, 207001 (2017) (Editors' Suggestion)

Enhanced ferromagnetic transition temperature induced by a microscopic structural rearrangement in the diluted magnetic semiconductor Ge1-xMnxTe

• M. Kriener, T. Nakajima, Y. Kaneko, A. Kikkawa, D. Hashizume, K. Kato, M. Takata, T. Arima, Y. Tokura, and Y. Taguchi 

• Phys. Rev. B 95, 224418 (2017).

Skyrmion lattice structural transition in MnSi,  

• Taro Nakajima, Hiroshi Oike, Akiko Kikkawa, Elliot P. Gilbert, Norman Booth, Kazuhisa Kakurai, Yasujiro Taguchi, Yoshinori Tokura, Fumitaka Kagawa and Taka-hisa Arima, 

• Sci. Adv. 3, e1602562 (2017), 

• Highlighted in RIKEN RESEARCH, 

• Media release from ANSTO: Neutron scattering helps clarify the arrangement of magnetic vortices, skyrmions, in material

Spin-lattice-coupling-mediated magnetoferroelectric phase transition induced by uniaxial pressure in multiferroic CuFe1-xMxO2 (M=Ga, Al)

• Hiromu Tamatsukuri, Setsuo Mitsuda, Tenfu Nakamura, Kouhei Takata, Taro Nakajima, Karel Prokes, Fabiano Yokaichiya, and Klaus Kiefer

• Phys. Rev. B 95, 174108 (2017).

E-type noncollinear magnetic ordering in multiferroic o-LuMnO3

• Saumya Mukherjee, Andreas Donni, Taro Nakajima, Setsuo Mitsuda, Makoto Tachibana, Hideaki Kitazawa, Vladimir Pomjakushin, Lukas Keller, Christof Niedermayer, Andrea Scaramucci, and Michel Kenzelmann 

• Phys. Rev. B 95, 104412 (2017).