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

Team Leader: Yoshichika Otani (D.Sci.)

Research Summary

Yoshichika  Otani(D.Sci.)

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

Related Links

Lab Members

Principal investigator

Yoshichika Otani
Team Leader

Core members

Bivas Rana
Research Scientist
Kouta Kondou
Research Scientist
Junyeon Kim
Postdoctoral Researcher
Jorge Luis Puebla Nunez
Postdoctoral Researcher
Tomoyuki Yokouchi
Special Postdoctoral Researcher
MingRan Xu
International Program Associate
Florent Auvray
Student Trainee
Hanshen Tsai
Student Trainee

Contact Information

317, Main Research Building, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: yotani [at] riken.jp

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