Biography
| 2009.03 | B.S. in Applied Physics, University of Tokyo (Supervisor : Prof. Yoshinori Tokura) |
| 2011.03 | M.S. in Applied Physics, University of Tokyo (Supervisor : Prof. Kazushi Kanoda) |
| 2014.03 | Ph.D. in Applied Physics, University of Tokyo (Supervisor : Prof. Kazushi Kanoda) |
| 2013.04 – 2014.05 | JSPS Research Fellow (DC2, PD) |
| 2014.06 – 2019.01 | Postdoctoral researcher, RIKEN Center for Emergent Matter Science (CEMS) |
| 2019.02 – 2019.03 | Researcher, RIKEN Center for Emergent Matter Science (CEMS) |
| 2019.04 – | Research Associate, Department of Applied Physics / Institute of Engineering Innovation, University of Tokyo |
Award
- Ando Incentive Prize for the Study of Electronics (2021.06, The Foundation of ANDO Laboratory)
- The Young Scientists’ Prize (2020.04, Ministry of Education, Culture, Sports, Science and Technology)
- Young Scientist Award (2019.11, Physical Society of Japan)
- Research Incentive Award (2019.03, RIKEN)
Original paper
- “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). - “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). - “Zoology of multiple-Q spin textures in a centrosymmetric tetragonal magnet with itinerant electrons”
N. D. Khanh, T. Nakajima, S. Hayami, S. Gao, Y. Yamasaki, H. Sagayama, H. Nakao, R. Takagi, Y. Motome, Y. Tokura, T. Arima, S. Seki
Advanced Science 2105452 (2022). - “Hybridized magnon modes in the quenched skyrmion crystal”
R. Takagi, M. Garst, J. Sahliger, C. H. Back, Y. Tokura, S. Seki
Phys. Rev. B 104, 144410 (2021). - “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). - “Multiorbital antiferromagnetic metal induced by intramolecular self-doping”
R. Takagi, H. Gangi, K. Miyagawa, E. Nishibori, H. Kasai, H. Seo, B. Zhou, A. Kobayashi, K. Kanoda
Phys. Rev. Research 2, 033321 (2020). - “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). - “Controlled transformation of skyrmions and antiskyrmions in a non-centrosymmetric magnet”
L. Peng, R. Takagi, W. Koshibae, K. Shibata, K. Nakajima, T. Arima, N. Nagaosa, S. Seki, X. Z. Yu, Y. Tokura
Nature Nanotechnology 15, 181 (2020). - “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). - “Bloch Lines Constituting Antiskyrmions Captured via Differential Phase Contrast”
F. S. Yasin, L. Peng, R. Takagi, N. Kanazawa, S. Seki, Y. Tokura, X. Z. Yu
Advanced Materials 32, 2004206 (2020). - “13C NMR evidence for strong electron correlation and antiferromagnetic order in the single-component molecular material Pd(tmdt)2”
T. Takahashi, K. Sunami, K. Miyagawa, R. Takagi, B. Zhou, A. Kobayashi, K. Kanoda
Phys. Rev. B 100, 075117 (2019). - “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). - “Low-field biskyrmion formation in a noncentrosymmetric chimney ladder ferromagnet”
R. Takagi, X. Z. Yu, J. S. White, K. Shibata, Y. Kaneko, G. Tatara, H. M. Rønnow, Y. Tokura, S. Seki
Phys. Rev. Lett. 120, 037203 (2018). - “Stabilization of magnetic skyrmions by uniaxial tensile strain”
S. Seki, Y. Okamura, K. Shibata, R. Takagi, N. D. Khanh, F. Kagawa, T. Arima, Y. Tokura
Phys. Rev. B 96, 220404(R) (2017). - “Antiferromagnetic Mott insulating state in the single-component molecular material Pd(tmdt)2″
R. Takagi, D. P. Sari, S. S. M.-Tajudin, R. Ashi, I. Watanabe, S. Ishibashi, K. Miyagawa, S. Ogura, B. Zhou, A. Kobayashi, and K. Kanoda
Phys. Rev. B 96, 214432 (2017). - “Spin-gapped Mott insulator with the dimeric arrangement of twisted molecules Zn(tmdt)2”
R. Takagi, H. Gangi, K. Miyagawa, B. Zhou, A. Kobayashi, and K. Kanoda
Phys. Rev. B 95, 224427 (2017). - “Spin-wave spectroscopy of the Dzyaloshinskii-Moriya interaction in room-temperature chiral magnets hosting skyrmions”
R. Takagi, D. Morikawa, K. Karube, N. Kanazawa, K. Shibata, G. Tatara, Y. Tokunaga, T. Arima, Y. Taguchi, Y. Tokura, and S. Seki
Phys. Rev. B 95, 220406(R) (2017). - “Single-component molecular material hosting antiferromagnetic and spin-gapped Mott subsystems”
R. Takagi, T. Hamai, H. Gangi, K. Miyagawa, B. Zhou, A. Kobayashi, and K. Kanoda
Phys. Rev. B 95, 094420 (2017). - “Thermal generation of spin current in a multiferroic helimagnet”
R. Takagi, Y. Tokunaga, T. Ideue, Y. Taguchi, Y. Tokura, and S. Seki
APL Mater. 4, 032502 (2016). - “Magnetochiral nonreciprocity of volume spin wave propagation in chiral-lattice ferromagnets”
S. Seki, Y. Okamura, K. Kondou, K. Shibata, M. Kubota, R. Takagi, F. Kagawa, M. Kawasaki, G. Tatara, Y. Otani, Y. Tokura
Phys. Rev. B 93, 235131 (2016). - “Electronic states and molecular dynamics of single-component molecular conductors [M(tmdt)2] (M = Ni, Pt) studied by 13C and 1H NMR”
R. Takagi, K. Miyagawa, M. Yoshimura, H. Gangi, K. Kanoda, B. Zhou, Y. Idobata, and A. Kobayashi
Phys. Rev. B 93, 024403 (2016). - “Antiferromagnetic Ordering in the Single-Component Molecular Conductor [Pd(tmdt)2]”
S. Ogura, Y. Idobata, B. Zhou, A. Kobayashi, R. Takagi, K. Miyagawa, K. Kanoda, H. Kasai, E. Nishibori, C. Satoko, and B. Delley
Inorg. Chem. 55, 7709 (2016). - “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). - “Single-Component Molecular Conductor [Cu(dmdt)2] with Three-dimensionally Arranged Magnetic Moments, Exhibiting a Coupled Electric and Magnetic Transition”
B. Zhou, Y. Idobata, A. Kobayashi, H. B. Cui, R. Kato, R. Takagi, K. Miyagawa, K. Kanoda, and H. Kobayashi
Journal of the American Chemical Society 134, 12724 (2012). - “NMR Evidence for Antiferromagnetic Transition in the Single-Component Molecular System, [Cu(tmdt)2]”
R. Takagi, K. Miyagawa, K. Kanoda, B. Zhou, A. Kobayashi, and H. Kobayashi
Phys. Rev. B 85, 184424 (2012).
Invited Talk
- “Multiple-q noncollinear magnetism in an itinerant hexagonal magnet”
R. Takagi, J. S. White, S. Hayami, R. Arita, D. Honecker, H. M. Ronnow, Y. Tokura, and S. Seki
4th International Conference on Functional Materials Science 2018 (ICFMS 2018), Bali, Indonesia, November 2018 - “Multiple-q Helimagnetism in an Itinerant Hexagonal Magnet”
R. Takagi, J. S. White, S. Hayami, D. Honecker, H. M. Ronnow, Y. Tokura, S. Seki
2018 International Conference on Magnetism (ICM2018), San Francisco, USA, August 2018 - “Diverse electronic states in single-component molecular materials M(tmdt)2”
R. Takagi, H. Gangi, T. Hamai, K. Miyagawa, I. Watanabe, D. Puspita, R. Ashi, S. S. Mohd-Tajudin, B. Zhou, A. Kobayashi, and K. Kanoda
International Workshop on Organic Molecular Systems, Pulau Pinang, Malaysia, August 2017