RIKEN Center for Emergent Matter Science Dynamic Emergent Phenomena Research Unit
Unit Leader: Fumitaka Kagawa (Ph.D.)
Our research unit explores dynamic phenomena exhibited by strongly correlated electron systems in both bulk specimen and device structures to construct a new principle in condensed matter science. In particular, we study external-field-driven dynamic phenomena exhibited by sub-micron-scale structures, such as topological spin textures and domain walls, using spectroscopy of dielectric responses and resistance fluctuations from the millihertz to gigahertz region. We also pursue real-space observations and measurements of local physical properties using scanning probe microscopy as a complementary approach. We are aiming to control novel physical properties exhibited by topological structures in condensed matter systems on the basis of knowledge obtained from these methods.
Main Research Fields
- Mathematical & Physical Sciences
Related Research Fields
- Interdisciplinary Science & Engineering
- Metal-insulator transition
- Phase-change memory
- Scanning probe microscopy
- Magnetic skyrmion
K. Matsuura, H. Oike, V. Kocsis, T. Sato, Y. Tomioka, Y. Kaneko, M. Nakamura, Y. Taguchi, M. Kawasaki, Y. Tokura, and F. Kagawa.:
"Kinetic pathway facilitated by a phase competition to achieve a metastable electronic phase"
Phys. Rev. B 103, L041106 (2021)
T. Sato, A. Kikkawa, Y. Taguchi, Y. Tokura, and F. Kagawa:
"Mode locking phenomena of the current-induced skyrmion-lattice motion in microfabricated MnSi"
Phys. Rev. B 102, 180411 (2020)
T. Sato, W. Koshibae, A. Kikkawa, T. Yokouchi, H. Oike, Y. Taguchi, N. Nagaosa, Y. Tokura, and F. Kagawa.:
"Slow steady flow of a skyrmion lattice in a confined geometry probed by resistance narrow-band noise"
Phys. Rev. B 100, 094410 (2019)
H. Oike, M. Kamitani, Y. Tokura, and F. Kagawa.:
"Kinetic approach to superconductivity hidden behind a competing order"
Sci. Adv. 4, eaau3489 (2018)
H. Oike, M. Suda, M. Kamitani, A. Ueda, H. Mori, Y. Tokura, H. M. Yamamoto, and F. Kagawa.:
"Size effects on supercooling phenomena in strongly correlated electron systems: IrTe2 and θ-(BEDT-TTF)2RbZn(SCN)4"
Phys. Rev. B 97, 085102 (2018)
F. Kagawa, H. Oike, W. Koshibae, A. Kikkawa, Y. Okamura, Y. Taguchi, N. Nagaosa, and Y. Tokura.:
"Current-induced viscoelastic topological unwinding of metastable skyrmion strings"
Nat. Commun. 8, 1332 (2017)
F. Kagawa and H. Oike.:
"Quenching of Charge and Spin Degrees of Freedom in Condensed Matter"
Adv. Mat. 29, 1601979 (2017)
Y. Okamura, F. Kagawa, S. Seki, and Y. Tokura.:
"Transition to and from the skyrmion lattice phase by electric fields in a magnetoelectric compound"
Nat. Commun. 7, 12669 (2016)
F. Kagawa, N. Minami, S. Horiuchi, and Y. Tokura.:
"Athermal domain-wall creep near a ferroelectric quantum critical point"
Nat. Commun. 7, 10675 (2016)
H. Oike, A. Kikkawa, N. Kanazawa, Y. Taguchi, M. Kawasaki, Y. Tokura, and F. Kagawa.:
"Interplay between topological and thermodynamic stability in a metastable magnetic skyrmion lattice"
Nat. Phys. 12, 62 (2016)
Recent Research Results
Dec. 28, 2018
Rapid cooling reveals superpowers
Oct. 21, 2016
‘Snap freezing’ produces different state
- Fumitaka Kagawa
- Unit Leader
- Takuro Sato
- Postdoctoral Researcher
- Meng Wang
- Postdoctoral Researcher
- Keisuke Matsuura
- Special Postdoctoral Researcher
- Hiroshi Oike
- Visiting Scientist
209 Frontier Research Laboratory
Email: fumitaka.kagawa [at] riken.jp