成果発表

代表的な原著論文（抜粋）（これまでの研究成果の一覧はこちら）

  1. “Spontaneous Hall effect induced by collinear antiferromagnetic order at room temperature”
    R. Takagi, R. Hirakida, Y. Settai, R. Oiwa, H. Takagi, A. Kitaori, K. Yamauchi, H. Inoue, J. Yamaura, D. Nishio-Hamane, S. Itoh, S. Aji, H. Saito, T. Nakajima, T. Nomoto, R. Arita, S. Seki
    Nature Materials (in press)


  2. “Exotic spin excitations in a polar magnet VOSe2O5”
    T. Araki, R. Takagi, T. Kurumaji, Y. Tokura, M. Mochizuki, S. Seki
    Phys. Rev. Lett. 133, 136702 (2024).


  3. “Multistep 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
    Nature Physics 20, 1001 (2024).


  4. “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 (2023).


  5. “Nonreciprocal Phonon Propagation in a Metallic Chiral Magnet”
    T. Nomura, X.-X. Zhang, R. Takagi, K. Karube, A. Kikkawa, Y. Taguchi, Y. Tokura, S. Zherlitsyn, Y. Kohama, S. Seki
    Phys. Rev. Lett. 130, 176301 (2023).


  6. “Square and rhombic lattices of magnetic skyrmions in a centrosymmetric binary compound”
    R. Takagi, N. Matsuyama, V. Ukleev, L. Yu, J. S. White, S. Francoual, J. R. L. Mardegan, S. Hayami, H. Saito, K. Kaneko, K. Ohishi, Y. Onuki, T. Arima, Y. Tokura, T. Nakajima, S. Seki
    Nature Communications 13, 1472 (2022).


  7. “Direct visualization of the three-dimensional shape of skyrmion strings in a noncentrosymmetric magnet”
    S. Seki, M. Suzuki, M. Ishibashi, R. Takagi, N. D. Khanh, Y. Shiota, K. Shibata, W. Koshibae, Y. Tokura, T. Ono
    Nature Materials 21, 181 (2022).


  8. “Imaging the coupling between itinerant electrons and localised moments in the centrosymmetric skyrmion magnet GdRu2Si2”
    Y. Yasui, C. Butler, N. D. Khanh, S. Hayami, T. Nomoto, T. Hanaguri, Y. Motome, R. Arita, T. Arima, Y. Tokura, S. Seki
    Nature Communications 11, 5925 (2020).


  9. “Particle-size dependent structural transformation of skyrmion lattice”
    R. Takagi, Y. Yamasaki, T. Yokouchi, V. Ukleev, Y. Yokoyama, H. Nakao, T. Arima, Y. Tokura, S. Seki
    Nature Communications 11, 5685 (2020).


  10. “Nanometric square skyrmion lattice in a centrosymmetric tetragonal magnet”
    N. D. Khanh, T. Nakajima, X. Z. Yu, S. Gao, K. Shibata, M. Hirschberger, Y. Yamasaki, H. Sagayama, H. Nakao, L. C. Peng, K. Nakajima, R. Takagi, T. Arima, Y. Tokura, S. Seki
    Nature Nanotechnology 15, 444 (2020).


  11. “Propagation dynamics of spin excitations along skyrmion strings”
    S. Seki, M. Garst, J. Waizner, R. Takagi, N. D. Khanh, Y. Okamura, K. Kondou, F. Kagawa, Y. Otani, Y. Tokura
    Nature Communications 11, 256 (2020).


  12. “Phonon Magnetochiral Effect”
    T. Nomura, X.-X. Zhang, S. Zherlitsyn, J. Wosnitza, Y. Tokura, N. Nagaosa, S. Seki
    Phys. Rev. Lett. 122, 145901 (2019). [Editor’s Suggestion, Highlighted in Physics]


  13. “Multiple-q non-collinear magnetism in an itinerant hexagonal magnet”
    R. Takagi, J. S. White, S. Hayami, R. Arita, D. Honecker, H. M. Ronnow, Y. Tokura, S. Seki
    Science Advances 4, 3402 (2018).


  14. “Low-field bi-skyrmion formation in a noncentrosymmetric chimney ladder ferromagnet”
    R. Takagi, X. Z. Yu, J. S. White, K. Shibata, Y. Kaneko, G. Tatara, H. M. Ronnow, Y. Tokura, S. Seki
    Phys. Rev. Lett. 120, 037203 (2018).


  15. “Thermal generation of spin current in an antiferromagnet”
    S. Seki, T. Ideue, M. Kubota, Y. Kozuka, R. Takagi, M. Nakamura, Y. Kaneko, M. Kawasaki, and Y. Tokura
    Phys. Rev. Lett. 115, 266601 (2015). [Editor’s Suggestion, Highlighted in Nature Nanotech. and Physics]


  16. “Observation of Skyrmions in a Multiferroic Material”
    S. Seki, X. Z. Yu, S. Ishiwata, and Y. Tokura
    Science 336, 198 (2012).


  17. “Electromagnons in the spin collinear state of a triangular lattice antiferromagnet”
    S. Seki, N. Kida, S. Kumakura, R. Shimano, and Y. Tokura
    Phys. Rev. Lett. 105, 097207 (2010).


  18. “Magnetic digital flop of ferroelectric domain with fixed spin chirality in a triangular lattice helimagnet”
    S. Seki, H. Murakawa, Y.Onose, and Y. Tokura
    Phys. Rev. Lett. 103, 237601 (2009).


  19. “Spin-driven ferroelectricity in triangular lattice antiferromagnets ACrO2 (A = Cu, Ag, Li, or Na) ”
    S. Seki, Y.Onose, and Y. Tokura
    Phys. Rev. Lett. 101, 067204 (2008).


  20. “Correlation between spin helicity and electric polarization vector in quantum-spin chain magnet LiCu2O2”
    S. Seki, Y. Yamasaki, M. Soda, M. Matsuura, K. Hirota, Y. Tokura
    Phys. Rev. Lett. 100, 127201 (2008).