RIKEN Center for Emergent Matter Science Dynamic Emergent Phenomena Research Team

Team Director: Fumitaka Kagawa (Ph.D.)

Japanese Page

Research Summary

Our research team 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
Engineering

Keywords

Metal-insulator transition
Phase-change memory
Scanning probe microscopy
Magnetic skyrmion

Selected Publications

1. Furuta, S., Koshibae, W., Matsuura, K., Abe, N., Wang, F., Zhou, S., Arima, T., and Kagawa, F.:
"Reconsidering nonlinear emergent inductance: Time-varying Joule heating and its impact on AC electrical response"
Phys. Rev. B 110, 174402 (2024).
2. Wang, M., Tanaka, K., Sakai, S., Wang, Z., Deng, K., Lyu, Y., Li, C., Tian, D., Sheng, S., Ogawa, N., Kanazawa, N., Yu, P., Arita, R., and Kagawa, F.:
"Emergent zero-field anomalous Hall effect in a reconstructed rutile antiferromagnetic metal"
Nat Commun 14, 8240 (2023).
3. Furuta, S., Moody, H., Kado, K., Koshibae, W., and Kagawa, F.:
"Energetic perspective on emergent inductance exhibited by magnetic textures in the pinned regime"
npj Spintronics 1, 1 (2023).
4. Matsuura, Y., Nishizawa, Y., Kinoshita, Y., Kurumaji, T., Miyaka, A., Oike, M., Tokunaga, M., Tokura, Y., and Kagawa, F.:
"Low-temperature hysteresis broadening emerging from domain-wall creep dynamics in a two-phase competing system"
Commun. Mat. 4, 71 (2023).
5. Sato, T., Koshibae, W., Kikkawa, A., Taguchi, Y., Nagaosa, N., Tokura, Y., and Kagawa, F.:
"Nonthermal current-induced transition from skyrmion lattice to nontopological magnetic phase in spatially confined MnSi"
Phys. Rev. B 106, 144425 (2022).
6. Sato, T., Koshibae, W., Kikkawa, A., Yokouchi, T., Oike, H., Taguchi, Y., Nagaosa, N., Tokura, Y., and Kagawa, F.:
"Slow steady flow of a skyrmion lattice in a confined geometry probed by resistance narrow-band noise"
Phys. Rev. B 100, 094410 (2019).
7. Oike, H., Kamitani, M., Tokura, Y., and Kagawa, F.:
"Kinetic approach to superconductivity hidden behind a competing order"
Sci. Adv. 4, eaau3489 (2018).
8. Kagawa, F., and Oike, H.:
"Quenching of Charge and Spin Degrees of Freedom in Condensed Matter"
Adv. Mat. 29, 1601979 (2017).
9. Kagawa, F., Minami, N., Horiuchi, S., and Tokura, Y.:
"Athermal domain-wall creep near a ferroelectric quantum critical point"
Nat. Commun. 7, 10675 (2016).
10. Oike, H., Kikkawa, A., Kanazawa, N., Taguchi, Y., Kawasaki, M., Tokura, Y., and Kagawa, F.:
"Interplay between topological and thermodynamic stability in a metastable magnetic skyrmion lattice"
Nat. Phys. 12, 62 (2016).