RIKEN Center for Emergent Matter Science Quantum Nano-Scale Magnetism Research Team
Team Leader: Yoshichika Otani (D.Sc.)
Research Summary
The Quantum Nano-Scale Magnetism Team fabricates ferromagnetic/nonmagnetic hybrid nanostructures from metals, semiconductors, insulators, and molecules to study quantum behaviors in domain wall displacement and magnetization dynamics mediated by spin current, a flow of spin angular momentum, and orbital current, a flow of orbital angular momentum. We focus our research on the fundamental process of interconversion and coupling between quasi-particles such as electron spin, magnon, phonon, and photon. In addition, we hope to develop a new technique for controlling spin conversion based on underlying exchange and spin-orbit interactions and a new class of low-power spintronic devices for novel energy harvesting.
Main Research Fields
- Mathematical & Physical Sciences
Related Research Fields
- Complex Systems
- Engineering
Keywords
- Spintronics
- Spin injection induced magnetization reversal
- Spin dynamics
- Spin-orbit interaction
- Spin hall effect
Selected Publications
- 1.
Wu, M., Chen, T., Nomoto, T., Tserkovnyak, Y., Isshiki, H., Nakatani, Y., Higo, T., Tomita, T., Kondou, K., Arita, R., Nakatsuji, S.,and Otani, Y.:
"Current-driven fast magnetic octupole domain-wall motion in noncollinear antiferromagnets"
Nature Commun. 15, 4305 (2024). - 2.
Isshiki, H., Budai, N., Kobayashi, A., Uesugi, R., Higo, T., Nakatsuji, S., and Otani, Y.:
"Observation of Cluster Magnetic Octupole Domains in the Antiferromagnetic Weyl Semimetal Mn3Sn Nanowire"
Phys. Rev. Lett. 132, 216702, (2024). - 3.
Hwang, Y., Puebla, J., Kondou, K., Gonzalez-Ballestero, C., Isshiki, H., S Sánchez Muñoz, C., Liao, L., Chen, F., Luo, W., Maekawa, S., and Otani, Y.:
"Strongly coupled spin waves and surface acoustic waves at room temperature"
Phys. Rev. Lett. 132, 056704 (2024). - 4.
Kim, J., Uzuhashi, J., Horio, M., Senoo, T., Go, D., Jo, D., Sumi, T., Wada, T., Matsuda, I., Ohkubo, T., Mitani, S., Lee, H-W., and Otani, Y.:
"Oxide layer dependent orbital torque efficiency in ferromagnet/Cu/oxide heterostructures"
Phys. Rev. Mater. 7, L111401 (2023). - 5.
Lyons, T., Puebla, J., Yamamoto, K., Deacon, R., Hwang, Y., Ishibashi, K., Maekawa, S., and Otani, Y.:
"Acoustically driven magnon-phonon coupling in a layered antiferromagnet" (Editors selection)
Phys. Rev. Lett. 131, 196701 (2023). - 6.
Liao, L., Puebla, J., Yamamoto, K., Kim, J., Maekawa, S., Hwang, Y., Ba, Y., and Otani, Y.:
"Valley-selective phonon-magnon scattering in magnetoelastic superlattices"
Phys. Rev. Lett. 131, 176701 (2023). - 7.
Budai, N., Isshiki, H., Uesugi, R., Zhu, Z., Higo, T., Nakatsuji, S., and Otani, Y.:
"High-resolution magnetic imaging by mapping the locally induced anomalous Nernst effect using atomic force microscopy"
Appl. Phys. Lett. 122, 102401 (2023). - 8.
Kondou, K., Shiga, M., Sakamoto, S., Inuzuka, H., Nihonyanagi, A., Araoka, F., Kobayashi, M., Miwa, S., Miyajima, D., and Otani, Y.:
"Chirality-induced magnetoresistance due to thermally driven spin polarization"
J. Am. Chem. Soc. 144, 7302 (2022). - 9.
Kim, J., Go, D., Tsai, H., Jo, D., Kondou, K., Lee, H-W., and Otani, Y.:
"Nontrivial torque generation by orbital angular momentum injection in ferromagnetic-metal/Cu/Al2O3 trilayers"
Phys. Rev. B 103, L020407 (2021). - 10.
Kondou, K., Chen, H., Tomita, T., Ikhlas, M., Higo, T., MacDonald, A. H., Nakatsuji, S., and Otani, Y.:
"Giant field-like torque by the out-of-plane magnetic spin Hall effect in a topological antiferromagnet"
Nature Commun. 12, 6491 (2021).
Recent Research Results
-
Apr. 4, 2024
Using ultrasound to probe antiferromagnets -
Dec. 25, 2020
A one-way street for sound waves -
Jun. 12, 2020
Sound waves create skyrmions in a magnetic film -
Nov. 28, 2017
Spins line up for data duty -
Nov. 24, 2017
New-wave spintronics comes to light -
Dec. 11, 2015
Metal−oxide interfaces create a flipping point
Related Links
Lab Members
Principal investigator
- Yoshichika Otani
- Team Leader
Core members
- Kouta Kondou
- Senior Scientist
- Jorge Luis Puebla Nunez
- Research Scientist
- You Ba
- Postdoctoral Researcher
- Junyeon Kim
- Visiting Scientist
- Liyang Liao
- Student Trainee
Contact Information
317, Main Research Building, 2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: yotani [at] riken.jp