RIKEN Center for Emergent Matter Science Quantum Nano-Scale Magnetism Research Team
Team Leader: Yoshichika Otani (D.Sc.)
Research Summary
At the surface of heavy elements and the interface of heterogeneous materials, the spin band splitting originates from the strong spin-orbit interaction. By exploiting such specific interfacial properties for spintronics, it is expected to realize ultra-thin and ultra-low power consumption devices. We investigate the generation of "spin current" that carries no electric charges but only spin angular momentum by applying the charge current at the interface. So that the spin current injection into nanoscale magnetic materials enables us to efficiently control the magnetic domain wall motion and magnon propagation. We aim at studying to develop new types of spintronic devices by using the techniques of spin current generation and injection.
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.B. Rana, Y. Fukuma, K. Miura, H. Takahashi and Y. Otani.:
"Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film"
Scientific Reports 7, 2318-1~9 (2017). - 2.K. Miura, S. Yabuuchi, M. Yamada, M. Ichimura, B. Rana, S. Ogawa, H. Takahashi, Y. Fukuma and Y. Otani.:
"Voltage-induced magnetization dynamics in CoFeB/MgO/CoFeB magnetic tunnel junctions"
Scientific Reports 7, 42511-1~8 (2017). - 3.K. Kondou, R. Yoshimi, A. Tsukazaki, Y. Fukuma, J. Matsuno, K. S. Takahashi, M. Kawasaki, Y. Tokura and Y. Otani.:
"Fermi-level-dependent charge-to-spin current conversion by Dirac surface states of topological insulators"
Nature Physics12, 1027-1031 (2016). - 4.S. Karube, K. Kondou and Y. Otani.:
"Experimental observation of spin-to-charge current conversion at non-magnetic metal/Bi2O3 interfaces"
Appl. Phys. Exp. 9, 033001-1~4 (2016). - 5.H. Idzuchi, Y. Fukuma and Y. Otani.:
"Spin transport in non-magnetic nano-structures induced by non-local spin injection"
Physica E 68, 239~263 (2015). - 6.O. Rousseau, M. Yamada, K. Miura, S. Ogawa and Y. Otani.:
"Propagation of nonlinearly generated harmonic spin waves in microscopic stripes"
J. Appl. Phys. 115, 053914-1~5 (2014). - 7.Y. Niimi, H. Suzuki, Y. Kawanishi, Y. Omori, T. Valet, A. Fert and Y. Otani.:
"Extrinsic spin Hall effects measured with lateral spin valve structures"
Phys. Rev. B 89, 054401-1~10 (2014). - 8.T. Wakamura, N. Hasegawa, K. Ohnishi, Y. Niimi and Y. Otani.:
"Spin injection into a superconductor with strong spin-orbit coupling"
Phys. Rev. Lett. 112, 036602-1~5 (2014). - 9.K. Fujiwara, Y. Fukuma, J. Matsuno, H. Idzuchi, Y. Niimi, Y. Otani and H. Takagi.:
"5d iridium oxide as a material for spin-current detection"
Nature Commun. 4, 2893-1~6 (2013). - 10.H. Idzuchi, S. Karube, Y. Fukuma, T. Aoki and Y. Otani.:
"Impact of interface properties on spin accumulation in dual-injection lateral spin valves"
Appl. Phys. Lett. 103, 162403-1~4 (2013).
Recent Research Results
-
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
- Bivas Rana
- Research Scientist
- Junyeon Kim
- Research Scientist
- Jorge Luis Puebla Nunez
- Research Scientist
- Mingxing Wu
- Junior Research Associate
- MingRan Xu
- Student Trainee
- Yunyoung Hwang
- Student Trainee
Contact Information
317, Main Research Building, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: yotani [at] riken.jp