RIKEN Center for Emergent Matter Science Electronic States Microscopy Research Team

Team Leader: Xiuzhen Yu (Ph.D.)

Japanese Page

Research Summary

Our team is working on the real-space observation of electron structures or topological electron-spin textures (skyrmion) and their dynamics in strong-correlation systems by means of atomic-resolution electron microscopy. We will use various microscopy techniques, such as the in-situ imaging technique, differential phase contrast microscopy, electron energy-loss spectroscopy, and energy dispersive spectroscopy, etc., to explore the electron structures and their dynamical phase transitions or phase separations. We also use these powerful tools to quantitatively characterize the nanometric magnetic and electric fields in topological matters to exploit emergent phenomena.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Complex Systems
Engineering

Keywords

Magnetic skyrmion
Microscopy
Atomic-level characterization of electronic states
Microfabrication
Spintronics

Selected Publications

1. X. Z. Yu, N. Nakanishi, Y.-L. Chiew, Y. Liu, K. Nakajima, N. Kanazawa, K. Karube, Y. Taguchi, N. Nagaosa, and Y. Tokura
"3D skyrmion strings and their melting dynamics revealed via scalar-field electron tomography"
Communications Materials 5, 80 (2024)
2. F. S. Yasin, J. Masell, Y. Takahashi, T. Akashi, N. Baba, K. Karube, D. Shindo, T. Arima, Y. Taguchi, Y. Tokura, T. Tanigaki, and X. Z. Yu
"Bloch point quadrupole constituting hybrid topological strings revealed with electron holographic vector field tomography"
Advanced Materials 36, 2311737 (2024)
3. F. S. Yasin, J. Masell, K. Karube, D. Shindo, Y. Taguchi, Y. Tokura, and X. Z. Yu
"Heat current-driven topological spin texture transformations and helical q-vector switching"
Nature Communications 14, 7094 (2023)
4. X. Z. Yu, Y. Liu, K. V. Iakoubovskii, K. Nakajima, N. Kanazawa, N. Nagaosa, and Y. Tokura
"Realization and Current-Driven Dynamics of Fractional Hopfions and Their Ensembles in a Helimagnet FeGe"
Advanced Materials, 35, 2210646 (2023)
5. Xiuzhen Yu, Fumitaka Kagawa, Shinichiro Seki, Masashi Kubota, Jan Masell, Fehmi S. Yasin, Kiyomi Nakajima, Masao Nakamura, Masashi Kawasaki, Naoto Nagaosa and Yoshinori Tokura
"Real-space observations of 60-nm skyrmion dynamics in an insulating magnet under low heat flow"
Nature Communications 12(1) (2021)
6. L. Peng, K. Karube, Y. Taguchi, N. Nagaosa, Y. Tokura, and X. Z. Yu
"Dynamic transition of current-driven single-skyrmion motion in a room-temperature chiral-lattice magnet"
Nature Communications, 12, 6797 (2021)
7. X. Z. Yu, D. Morikawa, K. Nakajima, K. Shibata,T. Arima, N. Nagaosa, and Y. Tokura
"Motion tracking of 80-nm-size skyrmions upon directional current injections"
Science Advances 6, eaaz9744 (2020)
8. L. Peng, R. Takagi, W. Koshibae, K. Shibata, K. Nakajima, T. H. Arima, N. Nagaosa, S. Seki, X. Z. Yu, and Yoshinori Tokura
"Controlled transformation of skyrmions and antiskyrmions in a non-centrosymmetric magnet"
Nature Nanotechnology 15, 181 (2020)
9. N. D. Khanh, T. Nakajima, X. Z. Yu, S. Gao, K. Shibata, M. Hirschberger, Y. Yamasaki, H. Sagayama, H. Nakao, L. Peng, K. Nakajima, R. Takagi, T. H. Arima, Y. Tokura, and S. Seki
"Nanometric square skyrmion lattice in a centrosymmetric tetragonal magnet"
Nature Nanotechnology 15, 444, (2020)
10. X. Z. Yu, W. Koshibae, Y. Tokunaga, K. Shibata, Y. Taguchi, N. Nagaosa, and Y. Tokura
"Transformation of topological spin textures between skyrmion and meron in a chiral magnet"
Nature 564, 95 (2018)