RIKEN Center for Emergent Matter Science Quantum Nano-Scale Magnetism Research Team

Team Leader: Yoshichika Otani (D.Sc.)

Japanese Page

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).